{"title":"Excel Calculators","description":"","products":[{"product_id":"useful-excel-calculator-basic-lev-maths","title":"Useful Excel Calculator - basic LEV Maths","description":"\u003ch3 data-start=\"316\" data-end=\"369\"\u003eA Practical Calculation Aid for LEV Practitioners\u003c\/h3\u003e\n\u003cp data-start=\"371\" data-end=\"521\"\u003eLEV calculations are a routine part of design, testing, and assessment — yet they’re also one of the most common sources of simple, repeatable errors.\u003c\/p\u003e\n\u003cp data-start=\"523\" data-end=\"664\"\u003eConverting between area, velocity, and volumetric flowrate.\u003cbr data-start=\"582\" data-end=\"585\"\u003eRearranging formulas on site.\u003cbr data-start=\"614\" data-end=\"617\"\u003eDouble-checking duct sizes under time pressure.\u003c\/p\u003e\n\u003cp data-start=\"666\" data-end=\"898\"\u003eThe \u003cstrong data-start=\"670\" data-end=\"706\"\u003eBasic LEV Maths Excel Calculator\u003c\/strong\u003e was created as a \u003cstrong data-start=\"724\" data-end=\"750\"\u003epractical support tool\u003c\/strong\u003e for LEV practitioners who want a quick, structured way to check calculations while keeping full ownership of the engineering judgement behind them.\u003c\/p\u003e\n\u003cp data-start=\"900\" data-end=\"1038\"\u003eThis is not a “black box” calculator — it’s a transparent, formula-based worksheet designed to mirror the maths used in everyday LEV work.\u003c\/p\u003e\n\u003chr data-start=\"1040\" data-end=\"1043\"\u003e\n\u003ch2 data-start=\"1045\" data-end=\"1089\"\u003eA Simple, Structured LEV Calculation Tool\u003c\/h2\u003e\n\u003cp data-start=\"1091\" data-end=\"1264\"\u003eThe calculator is laid out across \u003cstrong data-start=\"1125\" data-end=\"1155\"\u003efour clearly labelled tabs\u003c\/strong\u003e, each aligned with common LEV tasks encountered during design, inspection, and COSHH Regulation 9 TExT work.\u003c\/p\u003e\n\u003ch3 data-start=\"1266\" data-end=\"1293\"\u003eTab 1 – Basic LEV Maths\u003c\/h3\u003e\n\u003cp data-start=\"1294\" data-end=\"1444\"\u003eA reference tab covering core LEV mathematical relationships, helping reinforce understanding of how area, velocity, and volumetric flowrate interact.\u003c\/p\u003e\n\u003ch3 data-start=\"1446\" data-end=\"1486\"\u003eTab 2 – Find the Volumetric Flowrate\u003c\/h3\u003e\n\u003cp data-start=\"1487\" data-end=\"1651\"\u003eEnter duct or hood area and air velocity to calculate volumetric flowrate (Q).\u003cbr data-start=\"1565\" data-end=\"1568\"\u003eUseful for checking system balance, conservation of mass, and expected performance.\u003c\/p\u003e\n\u003ch3 data-start=\"1653\" data-end=\"1708\"\u003eTab 3 – Find the Duct Size from Volumetric Flowrate\u003c\/h3\u003e\n\u003cp data-start=\"1709\" data-end=\"1852\"\u003eCalculate duct diameter from a known volumetric flowrate.\u003cbr data-start=\"1766\" data-end=\"1769\"\u003eParticularly useful when reviewing design intent, modifications, or legacy systems.\u003c\/p\u003e\n\u003ch3 data-start=\"1854\" data-end=\"1912\"\u003eTab 4 – Find the Duct Size from Hood Area and Velocity\u003c\/h3\u003e\n\u003cp data-start=\"1913\" data-end=\"2045\"\u003eWork backwards from hood requirements to establish appropriate duct sizing, supporting hood design checks and airflow justification.\u003c\/p\u003e\n\u003chr data-start=\"2047\" data-end=\"2050\"\u003e\n\u003ch2 data-start=\"2052\" data-end=\"2104\"\u003eDesigned for Reliability — Not Accidental Changes\u003c\/h2\u003e\n\u003cp data-start=\"2106\" data-end=\"2168\"\u003eTo prevent accidental deletion or overwriting of calculations:\u003c\/p\u003e\n\u003cul data-start=\"2170\" data-end=\"2312\"\u003e\n\u003cli data-start=\"2170\" data-end=\"2204\"\u003e\n\u003cp data-start=\"2172\" data-end=\"2204\"\u003eAll formula cells are \u003cstrong data-start=\"2194\" data-end=\"2204\"\u003elocked\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2205\" data-end=\"2243\"\u003e\n\u003cp data-start=\"2207\" data-end=\"2243\"\u003eInput cells are clearly identifiable\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2244\" data-end=\"2312\"\u003e\n\u003cp data-start=\"2246\" data-end=\"2312\"\u003eThe structure is fixed to maintain consistency and repeatability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2314\" data-end=\"2445\"\u003eThis ensures the calculator behaves the same way every time it’s used — supporting defensible calculations and clear documentation.\u003c\/p\u003e\n\u003chr data-start=\"2447\" data-end=\"2450\"\u003e\n\u003ch2 data-start=\"2452\" data-end=\"2482\"\u003eImportant Professional Note\u003c\/h2\u003e\n\u003cp data-start=\"2484\" data-end=\"2571\"\u003eThis calculator is intended as a \u003cstrong data-start=\"2517\" data-end=\"2536\"\u003ecalculation aid\u003c\/strong\u003e, not a replacement for competence.\u003c\/p\u003e\n\u003cp data-start=\"2573\" data-end=\"2729\"\u003eWhile every effort has been made to enter formulas correctly, \u003cstrong data-start=\"2635\" data-end=\"2705\"\u003eno guarantee can be given that the spreadsheet is free from errors\u003c\/strong\u003e. Users are expected to:\u003c\/p\u003e\n\u003cul data-start=\"2731\" data-end=\"2885\"\u003e\n\u003cli data-start=\"2731\" data-end=\"2766\"\u003e\n\u003cp data-start=\"2733\" data-end=\"2766\"\u003eUnderstand the underlying maths\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2767\" data-end=\"2790\"\u003e\n\u003cp data-start=\"2769\" data-end=\"2790\"\u003eSense-check results\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2791\" data-end=\"2839\"\u003e\n\u003cp data-start=\"2793\" data-end=\"2839\"\u003eVerify calculations manually where necessary\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2840\" data-end=\"2885\"\u003e\n\u003cp data-start=\"2842\" data-end=\"2885\"\u003eApply professional judgement at all times\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2887\" data-end=\"2976\"\u003eIf any errors are identified, feedback is actively encouraged so corrections can be made.\u003c\/p\u003e\n\u003chr data-start=\"2978\" data-end=\"2981\"\u003e\n\u003ch2 data-start=\"2983\" data-end=\"3007\"\u003eWhy This Tool Matters\u003c\/h2\u003e\n\u003cp data-start=\"3009\" data-end=\"3060\"\u003eIn LEV work, small mathematical errors can lead to:\u003c\/p\u003e\n\u003cul data-start=\"3062\" data-end=\"3227\"\u003e\n\u003cli data-start=\"3062\" data-end=\"3087\"\u003e\n\u003cp data-start=\"3064\" data-end=\"3087\"\u003eIncorrect duct sizing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3088\" data-end=\"3123\"\u003e\n\u003cp data-start=\"3090\" data-end=\"3123\"\u003eInadequate transport velocities\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3124\" data-end=\"3155\"\u003e\n\u003cp data-start=\"3126\" data-end=\"3155\"\u003eMisinterpreted test results\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3156\" data-end=\"3184\"\u003e\n\u003cp data-start=\"3158\" data-end=\"3184\"\u003ePoor capture at the hood\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3185\" data-end=\"3227\"\u003e\n\u003cp data-start=\"3187\" data-end=\"3227\"\u003eWeak or indefensible Reg 9 conclusions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3229\" data-end=\"3390\"\u003eThis calculator helps reduce avoidable mistakes, improves consistency, and supports clearer thinking — while keeping responsibility firmly with the practitioner.\u003c\/p\u003e\n\u003chr data-start=\"3392\" data-end=\"3395\"\u003e\n\u003ch2 data-start=\"3397\" data-end=\"3426\"\u003eWho This Calculator Is For\u003c\/h2\u003e\n\u003cp data-start=\"3428\" data-end=\"3466\"\u003eThis Excel calculator is suitable for:\u003c\/p\u003e\n\u003cul data-start=\"3468\" data-end=\"3653\"\u003e\n\u003cli data-start=\"3468\" data-end=\"3497\"\u003e\n\u003cp data-start=\"3470\" data-end=\"3497\"\u003eLEV engineers and testers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3498\" data-end=\"3527\"\u003e\n\u003cp data-start=\"3500\" data-end=\"3527\"\u003eTrainee LEV practitioners\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3528\" data-end=\"3555\"\u003e\n\u003cp data-start=\"3530\" data-end=\"3555\"\u003eOccupational hygienists\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3556\" data-end=\"3584\"\u003e\n\u003cp data-start=\"3558\" data-end=\"3584\"\u003eDesigners and installers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3585\" data-end=\"3653\"\u003e\n\u003cp data-start=\"3587\" data-end=\"3653\"\u003eAnyone carrying out LEV calculations as part of COSHH compliance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3655\" data-end=\"3773\"\u003eIt works particularly well alongside \u003cstrong data-start=\"3692\" data-end=\"3719\"\u003eLEV107: Basic LEV Maths\u003c\/strong\u003e, reinforcing the calculations explained in the guide.\u003c\/p\u003e\n\u003chr data-start=\"3775\" data-end=\"3778\"\u003e\n\u003ch2 data-start=\"3780\" data-end=\"3798\"\u003eProduct Details\u003c\/h2\u003e\n\u003cul data-start=\"3800\" data-end=\"4151\"\u003e\n\u003cli data-start=\"3800\" data-end=\"3849\"\u003e\n\u003cp data-start=\"3802\" data-end=\"3849\"\u003e\u003cstrong data-start=\"3802\" data-end=\"3814\"\u003eProduct:\u003c\/strong\u003e Basic LEV Maths Excel Calculator\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3850\" data-end=\"3893\"\u003e\n\u003cp data-start=\"3852\" data-end=\"3893\"\u003e\u003cstrong data-start=\"3852\" data-end=\"3863\"\u003eFormat:\u003c\/strong\u003e Microsoft Excel spreadsheet\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3894\" data-end=\"3983\"\u003e\n\u003cp data-start=\"3896\" data-end=\"3983\"\u003e\u003cstrong data-start=\"3896\" data-end=\"3905\"\u003eTabs:\u003c\/strong\u003e 4 (Basic Maths, Flowrate, Duct Size from Q, Duct Size from Area \u0026amp; Velocity)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3984\" data-end=\"4038\"\u003e\n\u003cp data-start=\"3986\" data-end=\"4038\"\u003e\u003cstrong data-start=\"3986\" data-end=\"3999\"\u003eFormulas:\u003c\/strong\u003e Locked to prevent accidental editing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4039\" data-end=\"4116\"\u003e\n\u003cp data-start=\"4041\" data-end=\"4116\"\u003e\u003cstrong data-start=\"4041\" data-end=\"4054\"\u003eUse Case:\u003c\/strong\u003e LEV design checks, TExT support, training, and verification\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4117\" data-end=\"4151\"\u003e\n\u003cp data-start=\"4119\" data-end=\"4151\"\u003e\u003cstrong data-start=\"4119\" data-end=\"4130\"\u003eAuthor:\u003c\/strong\u003e Louise Davies Wood\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LEV Academy","offers":[{"title":"Default Title","offer_id":52700429222227,"sku":null,"price":25.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1017\/3313\/8771\/files\/Screenshot2026-01-01212307.png?v=1767302674"},{"product_id":"tools-of-the-trade-fluid-mechanics-excel-calculator","title":"Tools of the Trade: Fluid Mechanics Excel Calculator","description":"\u003ch3 data-start=\"366\" data-end=\"429\"\u003eCorrecting LEV Measurements for Non-Standard Air Conditions\u003c\/h3\u003e\n\u003cp data-start=\"431\" data-end=\"730\"\u003eIn most LEV work, calculations are taught and carried out using \u003cstrong data-start=\"495\" data-end=\"522\"\u003estandard air conditions\u003c\/strong\u003e — an air density of \u003cstrong data-start=\"543\" data-end=\"556\"\u003e1.2 kg\/m³\u003c\/strong\u003e, equivalent to dry air at \u003cstrong data-start=\"583\" data-end=\"596\"\u003e1013 mbar\u003c\/strong\u003e and \u003cstrong data-start=\"601\" data-end=\"610\"\u003e20 °C\u003c\/strong\u003e. This assumption underpins much of the LEV maths taught in BOHS qualifications and referenced in engineering standards.\u003c\/p\u003e\n\u003cp data-start=\"732\" data-end=\"795\"\u003eHowever, not all LEV systems operate under standard conditions.\u003c\/p\u003e\n\u003cp data-start=\"797\" data-end=\"1156\"\u003eDuring a COSHH Regulation 9 Thorough Examination and Test (TExT), practitioners regularly encounter \u003cstrong data-start=\"897\" data-end=\"917\"\u003enon-standard air\u003c\/strong\u003e — most commonly due to \u003cstrong data-start=\"941\" data-end=\"966\"\u003eelevated temperatures\u003c\/strong\u003e from hot processes, ovens, or extrusion systems. In these cases, velocity and pressure are measured as normal, but the results \u003cstrong data-start=\"1094\" data-end=\"1116\"\u003erequire correction\u003c\/strong\u003e if they are to be interpreted properly.\u003c\/p\u003e\n\u003cp data-start=\"1158\" data-end=\"1281\"\u003eThe \u003cstrong data-start=\"1162\" data-end=\"1198\"\u003eFluid Mechanics Excel Calculator\u003c\/strong\u003e was created to support those corrections — clearly, transparently, and defensibly.\u003c\/p\u003e\n\u003chr data-start=\"1283\" data-end=\"1286\"\u003e\n\u003ch2 data-start=\"1288\" data-end=\"1338\"\u003eA Practical Tool for Real-World LEV Assessments\u003c\/h2\u003e\n\u003cp data-start=\"1340\" data-end=\"1477\"\u003eThis calculator is designed to help practitioners account for \u003cstrong data-start=\"1402\" data-end=\"1425\"\u003eair density changes\u003c\/strong\u003e where temperature differs from standard conditions.\u003c\/p\u003e\n\u003cp data-start=\"1479\" data-end=\"1491\"\u003eIt supports:\u003c\/p\u003e\n\u003cul data-start=\"1493\" data-end=\"1745\"\u003e\n\u003cli data-start=\"1493\" data-end=\"1543\"\u003e\n\u003cp data-start=\"1495\" data-end=\"1543\"\u003eAdjustment of \u003cstrong data-start=\"1509\" data-end=\"1543\"\u003emeasured (actual) air velocity\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1544\" data-end=\"1604\"\u003e\n\u003cp data-start=\"1546\" data-end=\"1604\"\u003eCalculation of \u003cstrong data-start=\"1561\" data-end=\"1583\"\u003ecorrected velocity\u003c\/strong\u003e based on temperature\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1605\" data-end=\"1664\"\u003e\n\u003cp data-start=\"1607\" data-end=\"1664\"\u003eImproved interpretation of pressure and velocity readings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1665\" data-end=\"1745\"\u003e\n\u003cp data-start=\"1667\" data-end=\"1745\"\u003eClear differentiation between \u003cem data-start=\"1697\" data-end=\"1707\"\u003emeasured\u003c\/em\u003e and \u003cem data-start=\"1712\" data-end=\"1723\"\u003ecorrected\u003c\/em\u003e results for reporting\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1747\" data-end=\"1943\"\u003eThe approach aligns with guidance from \u003cstrong data-start=\"1786\" data-end=\"1795\"\u003eACGIH\u003c\/strong\u003e and recognised industry practice, acknowledging that while altitude is rarely significant in UK industrial settings, \u003cstrong data-start=\"1913\" data-end=\"1942\"\u003etemperature absolutely is\u003c\/strong\u003e.\u003c\/p\u003e\n\u003chr data-start=\"1945\" data-end=\"1948\"\u003e\n\u003ch2 data-start=\"1950\" data-end=\"1985\"\u003eUnderstanding the Two Velocities\u003c\/h2\u003e\n\u003cp data-start=\"1987\" data-end=\"2090\"\u003eOne of the most common sources of confusion in non-standard air calculations is the difference between:\u003c\/p\u003e\n\u003col data-start=\"2092\" data-end=\"2313\"\u003e\n\u003cli data-start=\"2092\" data-end=\"2204\"\u003e\n\u003cp data-start=\"2095\" data-end=\"2204\"\u003e\u003cstrong data-start=\"2095\" data-end=\"2114\"\u003eActual Velocity\u003c\/strong\u003e\u003cbr data-start=\"2114\" data-end=\"2117\"\u003eThe velocity calculated directly from instrument readings at the time of assessment.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2206\" data-end=\"2313\"\u003e\n\u003cp data-start=\"2209\" data-end=\"2313\"\u003e\u003cstrong data-start=\"2209\" data-end=\"2231\"\u003eCorrected Velocity\u003c\/strong\u003e\u003cbr data-start=\"2231\" data-end=\"2234\"\u003eThe velocity adjusted to account for air density changes due to temperature.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp data-start=\"2315\" data-end=\"2447\"\u003eThe calculator allows both to be determined — and the guidance strongly recommends that \u003cstrong data-start=\"2403\" data-end=\"2446\"\u003eboth values are recorded in LEV reports\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"2449\" data-end=\"2466\"\u003eWhy this matters:\u003c\/p\u003e\n\u003cul data-start=\"2468\" data-end=\"2740\"\u003e\n\u003cli data-start=\"2468\" data-end=\"2552\"\u003e\n\u003cp data-start=\"2470\" data-end=\"2552\"\u003eThe \u003cem data-start=\"2474\" data-end=\"2491\"\u003eactual velocity\u003c\/em\u003e provides a reliable comparison point for future site visits.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2553\" data-end=\"2654\"\u003e\n\u003cp data-start=\"2555\" data-end=\"2654\"\u003eThe \u003cem data-start=\"2559\" data-end=\"2579\"\u003ecorrected velocity\u003c\/em\u003e provides a more accurate engineering interpretation of system performance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2655\" data-end=\"2740\"\u003e\n\u003cp data-start=\"2657\" data-end=\"2740\"\u003eUsing the wrong velocity in volume calculations can lead to \u003cstrong data-start=\"2717\" data-end=\"2739\"\u003esignificant errors\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2742\" data-end=\"2745\"\u003e\n\u003ch2 data-start=\"2747\" data-end=\"2788\"\u003eImportant Notes on Volumetric Flowrate\u003c\/h2\u003e\n\u003cp data-start=\"2790\" data-end=\"2833\"\u003eWhen working under non-standard conditions:\u003c\/p\u003e\n\u003cul data-start=\"2835\" data-end=\"3088\"\u003e\n\u003cli data-start=\"2835\" data-end=\"2917\"\u003e\n\u003cp data-start=\"2837\" data-end=\"2917\"\u003eThe standard velocity–volume–area triangle \u003cstrong data-start=\"2880\" data-end=\"2917\"\u003ecannot always be applied directly\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2918\" data-end=\"2995\"\u003e\n\u003cp data-start=\"2920\" data-end=\"2995\"\u003eCalculating volume from corrected velocity requires a \u003cstrong data-start=\"2974\" data-end=\"2995\"\u003edifferent formula\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2996\" data-end=\"3088\"\u003e\n\u003cp data-start=\"2998\" data-end=\"3088\"\u003eUsing the wrong relationship can return a volumetric flowrate that is materially incorrect\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3090\" data-end=\"3199\"\u003eThis tool helps avoid that pitfall — but only when used by someone who understands the underlying principles.\u003c\/p\u003e\n\u003chr data-start=\"3201\" data-end=\"3204\"\u003e\n\u003ch2 data-start=\"3206\" data-end=\"3247\"\u003eProfessional Boundaries and Exclusions\u003c\/h2\u003e\n\u003cp data-start=\"3249\" data-end=\"3303\"\u003eThis calculator is intentionally \u003cstrong data-start=\"3282\" data-end=\"3302\"\u003elimited in scope\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"3305\" data-end=\"3333\"\u003eIt does \u003cstrong data-start=\"3313\" data-end=\"3320\"\u003enot\u003c\/strong\u003e account for:\u003c\/p\u003e\n\u003cul data-start=\"3335\" data-end=\"3417\"\u003e\n\u003cli data-start=\"3335\" data-end=\"3353\"\u003e\n\u003cp data-start=\"3337\" data-end=\"3353\"\u003eMoisture content\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3354\" data-end=\"3372\"\u003e\n\u003cp data-start=\"3356\" data-end=\"3372\"\u003eGases or vapours\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3373\" data-end=\"3417\"\u003e\n\u003cp data-start=\"3375\" data-end=\"3417\"\u003eMixed airstreams with changing composition\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3419\" data-end=\"3640\"\u003eThese factors also affect air density and require \u003cstrong data-start=\"3469\" data-end=\"3496\"\u003eadditional calculations\u003c\/strong\u003e, as set out in ACGIH guidance. Where they are present, calculations must be carried out by a \u003cstrong data-start=\"3590\" data-end=\"3610\"\u003ecompetent person\u003c\/strong\u003e using appropriate references.\u003c\/p\u003e\n\u003chr data-start=\"3642\" data-end=\"3645\"\u003e\n\u003ch2 data-start=\"3647\" data-end=\"3670\"\u003eImportant Disclaimer\u003c\/h2\u003e\n\u003cp data-start=\"3672\" data-end=\"3734\"\u003eThis tool is provided as a \u003cstrong data-start=\"3699\" data-end=\"3733\"\u003ereference and support aid only\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul data-start=\"3736\" data-end=\"3952\"\u003e\n\u003cli data-start=\"3736\" data-end=\"3785\"\u003e\n\u003cp data-start=\"3738\" data-end=\"3785\"\u003eEvery effort has been made to minimise errors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3786\" data-end=\"3846\"\u003e\n\u003cp data-start=\"3788\" data-end=\"3846\"\u003eNo guarantee is given that the spreadsheet is error-free\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3847\" data-end=\"3887\"\u003e\n\u003cp data-start=\"3849\" data-end=\"3887\"\u003eNo liability is accepted for its use\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3888\" data-end=\"3952\"\u003e\n\u003cp data-start=\"3890\" data-end=\"3952\"\u003eUsers are responsible for checking all calculations manually\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3954\" data-end=\"4095\"\u003eIf you choose to use this tool, you are expected to understand the maths, sense-check outputs, and apply professional judgement at all times.\u003c\/p\u003e\n\u003cp data-start=\"4097\" data-end=\"4153\"\u003eFeedback on errors or issues is welcomed and encouraged.\u003c\/p\u003e\n\u003chr data-start=\"4155\" data-end=\"4158\"\u003e\n\u003ch2 data-start=\"4160\" data-end=\"4184\"\u003eWhy This Tool Matters\u003c\/h2\u003e\n\u003cp data-start=\"4186\" data-end=\"4240\"\u003eFailing to account for non-standard air can result in:\u003c\/p\u003e\n\u003cul data-start=\"4242\" data-end=\"4411\"\u003e\n\u003cli data-start=\"4242\" data-end=\"4271\"\u003e\n\u003cp data-start=\"4244\" data-end=\"4271\"\u003eMisinterpreted velocities\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4272\" data-end=\"4322\"\u003e\n\u003cp data-start=\"4274\" data-end=\"4322\"\u003eIncorrect performance comparisons year-to-year\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4323\" data-end=\"4361\"\u003e\n\u003cp data-start=\"4325\" data-end=\"4361\"\u003ePoorly justified Reg 9 conclusions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4362\" data-end=\"4411\"\u003e\n\u003cp data-start=\"4364\" data-end=\"4411\"\u003eConfusion during audits or enforcement visits\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4413\" data-end=\"4550\"\u003eThis calculator helps practitioners \u003cstrong data-start=\"4449\" data-end=\"4522\"\u003ethink clearly, record transparently, and justify decisions defensibly\u003c\/strong\u003e — without hiding the maths.\u003c\/p\u003e\n\u003chr data-start=\"4552\" data-end=\"4555\"\u003e\n\u003ch2 data-start=\"4557\" data-end=\"4586\"\u003eWho This Calculator Is For\u003c\/h2\u003e\n\u003cp data-start=\"4588\" data-end=\"4614\"\u003eThis tool is intended for:\u003c\/p\u003e\n\u003cul data-start=\"4616\" data-end=\"4782\"\u003e\n\u003cli data-start=\"4616\" data-end=\"4657\"\u003e\n\u003cp data-start=\"4618\" data-end=\"4657\"\u003eLEV engineers and COSHH Reg 9 testers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4658\" data-end=\"4685\"\u003e\n\u003cp data-start=\"4660\" data-end=\"4685\"\u003eOccupational hygienists\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4686\" data-end=\"4716\"\u003e\n\u003cp data-start=\"4688\" data-end=\"4716\"\u003eAdvanced LEV practitioners\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4717\" data-end=\"4782\"\u003e\n\u003cp data-start=\"4719\" data-end=\"4782\"\u003eThose working with hot processes or elevated air temperatures\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4784\" data-end=\"4899\"\u003eIt is best used alongside formal guidance such as \u003cstrong data-start=\"4834\" data-end=\"4866\"\u003eACGIH Industrial Ventilation\u003c\/strong\u003e and \u003cstrong data-start=\"4871\" data-end=\"4898\"\u003eLEV107: Basic LEV Maths\u003c\/strong\u003e.\u003c\/p\u003e\n\u003chr data-start=\"4901\" data-end=\"4904\"\u003e\n\u003ch2 data-start=\"4906\" data-end=\"4924\"\u003eProduct Details\u003c\/h2\u003e\n\u003cul data-start=\"4926\" data-end=\"5251\"\u003e\n\u003cli data-start=\"4926\" data-end=\"4996\"\u003e\n\u003cp data-start=\"4928\" data-end=\"4996\"\u003e\u003cstrong data-start=\"4928\" data-end=\"4940\"\u003eProduct:\u003c\/strong\u003e Tools of the Trade – Fluid Mechanics Excel Calculator\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4997\" data-end=\"5040\"\u003e\n\u003cp data-start=\"4999\" data-end=\"5040\"\u003e\u003cstrong data-start=\"4999\" data-end=\"5010\"\u003eFormat:\u003c\/strong\u003e Microsoft Excel spreadsheet\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5041\" data-end=\"5115\"\u003e\n\u003cp data-start=\"5043\" data-end=\"5115\"\u003e\u003cstrong data-start=\"5043\" data-end=\"5053\"\u003eFocus:\u003c\/strong\u003e Correcting LEV calculations for non-standard air conditions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5116\" data-end=\"5172\"\u003e\n\u003cp data-start=\"5118\" data-end=\"5172\"\u003e\u003cstrong data-start=\"5118\" data-end=\"5131\"\u003eBased On:\u003c\/strong\u003e ACGIH principles and industry practice\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5173\" data-end=\"5207\"\u003e\n\u003cp data-start=\"5175\" data-end=\"5207\"\u003e\u003cstrong data-start=\"5175\" data-end=\"5186\"\u003eAuthor:\u003c\/strong\u003e Louise Davies Wood\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5208\" data-end=\"5251\"\u003e\n\u003cp data-start=\"5210\" data-end=\"5251\"\u003e\u003cstrong data-start=\"5210\" data-end=\"5234\"\u003eOriginally Released:\u003c\/strong\u003e September 2022\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LEV Academy","offers":[{"title":"Default Title","offer_id":52700439413075,"sku":null,"price":55.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1017\/3313\/8771\/files\/Screenshot2026-01-01212349_483926f9-0cc0-4f6c-b17b-f841038c82c4.png?v=1767302727"},{"product_id":"vehicle-exhaust-emissions-lev","title":"Vehicle Exhaust Emissions \u0026 LEV","description":"\u003ch2 data-start=\"377\" data-end=\"431\"\u003eEngine-Matched Extraction Sizing Excel Calculator\u003c\/h2\u003e\n\u003ch3 data-start=\"432\" data-end=\"508\"\u003eA Practical Tool for Designing and Assessing Vehicle Exhaust LEV Systems\u003c\/h3\u003e\n\u003cp data-start=\"510\" data-end=\"874\"\u003eVehicle exhaust emissions are a significant occupational health hazard in garages, workshops, depots, MOT stations, and testing facilities. Petrol, diesel, LPG, and other internal combustion engines emit a complex mixture of \u003cstrong data-start=\"735\" data-end=\"777\"\u003etoxic gases and hazardous particulates\u003c\/strong\u003e, many of which are invisible yet capable of causing serious short- and long-term health effects.\u003c\/p\u003e\n\u003cp data-start=\"876\" data-end=\"1053\"\u003eEffective \u003cstrong data-start=\"886\" data-end=\"922\"\u003evehicle exhaust extraction (LEV)\u003c\/strong\u003e is therefore a critical engineering control — but only when it is \u003cstrong data-start=\"989\" data-end=\"1052\"\u003ecorrectly sized, correctly applied, and properly understood\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"1055\" data-end=\"1311\"\u003eThis Excel calculator was developed to support \u003cstrong data-start=\"1102\" data-end=\"1152\"\u003ereal-world LEV design and assessment decisions\u003c\/strong\u003e, helping practitioners match extraction capacity to \u003cstrong data-start=\"1205\" data-end=\"1245\"\u003eengine size and operating conditions\u003c\/strong\u003e, rather than relying on guesswork or over-simplified assumptions.\u003c\/p\u003e\n\u003chr data-start=\"1313\" data-end=\"1316\"\u003e\n\u003ch2 data-start=\"1318\" data-end=\"1373\"\u003eA Practical Sizing Tool Based on Recognised Guidance\u003c\/h2\u003e\n\u003cp data-start=\"1375\" data-end=\"1445\"\u003eThe calculator is based on principles and reference values drawn from:\u003c\/p\u003e\n\u003cul data-start=\"1447\" data-end=\"1658\"\u003e\n\u003cli data-start=\"1447\" data-end=\"1510\"\u003e\n\u003cp data-start=\"1449\" data-end=\"1510\"\u003e\u003cstrong data-start=\"1449\" data-end=\"1468\"\u003eEGEA Guidelines\u003c\/strong\u003e (European Garage Equipment Association)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1511\" data-end=\"1574\"\u003e\n\u003cp data-start=\"1513\" data-end=\"1574\"\u003e\u003cstrong data-start=\"1513\" data-end=\"1527\"\u003eHSE HSG187\u003c\/strong\u003e – Control of diesel engine exhaust emissions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1575\" data-end=\"1617\"\u003e\n\u003cp data-start=\"1577\" data-end=\"1617\"\u003e\u003cstrong data-start=\"1577\" data-end=\"1587\"\u003eHSG258\u003c\/strong\u003e – Local Exhaust Ventilation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1618\" data-end=\"1658\"\u003e\n\u003cp data-start=\"1620\" data-end=\"1658\"\u003eEstablished LEV engineering practice\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1660\" data-end=\"1750\"\u003eIt provides a structured way to estimate \u003cstrong data-start=\"1701\" data-end=\"1740\"\u003erequired exhaust extraction volumes\u003c\/strong\u003e based on:\u003c\/p\u003e\n\u003cul data-start=\"1752\" data-end=\"1910\"\u003e\n\u003cli data-start=\"1752\" data-end=\"1787\"\u003e\n\u003cp data-start=\"1754\" data-end=\"1787\"\u003eEngine size (litres \/ capacity)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1788\" data-end=\"1810\"\u003e\n\u003cp data-start=\"1790\" data-end=\"1810\"\u003eEngine speed (rpm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1811\" data-end=\"1848\"\u003e\n\u003cp data-start=\"1813\" data-end=\"1848\"\u003eVehicle type (cars, vans, trucks)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1849\" data-end=\"1910\"\u003e\n\u003cp data-start=\"1851\" data-end=\"1910\"\u003eTypical operating scenarios (idling, testing, higher rpm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1912\" data-end=\"2008\"\u003eThe aim is to help ensure systems are \u003cstrong data-start=\"1950\" data-end=\"2007\"\u003eneither under-extracting nor excessively over-powered\u003c\/strong\u003e.\u003c\/p\u003e\n\u003chr data-start=\"2010\" data-end=\"2013\"\u003e\n\u003ch2 data-start=\"2015\" data-end=\"2044\"\u003eWhy Correct Sizing Matters\u003c\/h2\u003e\n\u003cp data-start=\"2046\" data-end=\"2143\"\u003eMost guidance focuses on avoiding \u003cem data-start=\"2080\" data-end=\"2098\"\u003eunder-extraction\u003c\/em\u003e — but \u003cstrong data-start=\"2105\" data-end=\"2142\"\u003eover-extraction carries risks too\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"2145\" data-end=\"2311\"\u003eThis tool is designed to support \u003cstrong data-start=\"2178\" data-end=\"2197\"\u003ebalanced design\u003c\/strong\u003e, recognising that extraction systems must remove \u003cem data-start=\"2247\" data-end=\"2263\"\u003ewhat is needed\u003c\/em\u003e — no less, but also \u003cstrong data-start=\"2284\" data-end=\"2310\"\u003eno more than necessary\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 data-start=\"2313\" data-end=\"2342\"\u003eRisks of Under-Extraction\u003c\/h3\u003e\n\u003cul data-start=\"2343\" data-end=\"2566\"\u003e\n\u003cli data-start=\"2343\" data-end=\"2403\"\u003e\n\u003cp data-start=\"2345\" data-end=\"2403\"\u003eExhaust gases and particulates escape into the workspace\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2404\" data-end=\"2472\"\u003e\n\u003cp data-start=\"2406\" data-end=\"2472\"\u003eIncreased exposure to CO, NOx, diesel particulate matter (DEEEs)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2473\" data-end=\"2527\"\u003e\n\u003cp data-start=\"2475\" data-end=\"2527\"\u003eFailure to adequately control exposure under COSHH\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2528\" data-end=\"2566\"\u003e\n\u003cp data-start=\"2530\" data-end=\"2566\"\u003eOdour, irritation, soot deposition\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"2568\" data-end=\"2596\"\u003eRisks of Over-Extraction\u003c\/h3\u003e\n\u003cul data-start=\"2597\" data-end=\"2908\"\u003e\n\u003cli data-start=\"2597\" data-end=\"2658\"\u003e\n\u003cp data-start=\"2599\" data-end=\"2658\"\u003eAltered exhaust back pressure, affecting engine behaviour\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2659\" data-end=\"2726\"\u003e\n\u003cp data-start=\"2661\" data-end=\"2726\"\u003ePoor performance of catalytic converters or particulate filters\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2727\" data-end=\"2801\"\u003e\n\u003cp data-start=\"2729\" data-end=\"2801\"\u003eExcessive cooling of exhaust systems (cold start issues, condensation)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2802\" data-end=\"2855\"\u003e\n\u003cp data-start=\"2804\" data-end=\"2855\"\u003eMechanical strain on exhaust components and hoses\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2856\" data-end=\"2908\"\u003e\n\u003cp data-start=\"2858\" data-end=\"2908\"\u003eIncreased energy use, noise, and operating costs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2910\" data-end=\"2981\"\u003eThis calculator helps practitioners understand and avoid both extremes.\u003c\/p\u003e\n\u003chr data-start=\"2983\" data-end=\"2986\"\u003e\n\u003ch2 data-start=\"2988\" data-end=\"3045\"\u003eDesigned for LEV Practitioners — Not Black-Box Outputs\u003c\/h2\u003e\n\u003cp data-start=\"3047\" data-end=\"3119\"\u003eThe calculator supports professional judgement rather than replacing it.\u003c\/p\u003e\n\u003cp data-start=\"3121\" data-end=\"3136\"\u003eIt helps users:\u003c\/p\u003e\n\u003cul data-start=\"3138\" data-end=\"3334\"\u003e\n\u003cli data-start=\"3138\" data-end=\"3188\"\u003e\n\u003cp data-start=\"3140\" data-end=\"3188\"\u003eEstimate appropriate extraction airflow (m³\/h)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3189\" data-end=\"3235\"\u003e\n\u003cp data-start=\"3191\" data-end=\"3235\"\u003eCompare system capacity with engine demand\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3236\" data-end=\"3273\"\u003e\n\u003cp data-start=\"3238\" data-end=\"3273\"\u003eSense-check installed LEV systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3274\" data-end=\"3334\"\u003e\n\u003cp data-start=\"3276\" data-end=\"3334\"\u003eSupport defensible design and Reg 9 assessment decisions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3336\" data-end=\"3377\"\u003eIt is particularly useful when reviewing:\u003c\/p\u003e\n\u003cul data-start=\"3379\" data-end=\"3560\"\u003e\n\u003cli data-start=\"3379\" data-end=\"3416\"\u003e\n\u003cp data-start=\"3381\" data-end=\"3416\"\u003eFixed tailpipe extraction systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3417\" data-end=\"3455\"\u003e\n\u003cp data-start=\"3419\" data-end=\"3455\"\u003eHose and clip-on scavenger systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3456\" data-end=\"3491\"\u003e\n\u003cp data-start=\"3458\" data-end=\"3491\"\u003eMulti-branch extraction systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3492\" data-end=\"3560\"\u003e\n\u003cp data-start=\"3494\" data-end=\"3560\"\u003eWorkshop bays where multiple vehicles may connect simultaneously\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3562\" data-end=\"3565\"\u003e\n\u003ch2 data-start=\"3567\" data-end=\"3608\"\u003eSupporting COSHH \u0026amp; LEV Assessment Work\u003c\/h2\u003e\n\u003cp data-start=\"3610\" data-end=\"3670\"\u003eThe calculator complements broader LEV duties by supporting:\u003c\/p\u003e\n\u003cul data-start=\"3672\" data-end=\"3891\"\u003e\n\u003cli data-start=\"3672\" data-end=\"3698\"\u003e\n\u003cp data-start=\"3674\" data-end=\"3698\"\u003eCOSHH risk assessments\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3699\" data-end=\"3738\"\u003e\n\u003cp data-start=\"3701\" data-end=\"3738\"\u003eLEV system design and specification\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3739\" data-end=\"3763\"\u003e\n\u003cp data-start=\"3741\" data-end=\"3763\"\u003eCommissioning checks\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3764\" data-end=\"3823\"\u003e\n\u003cp data-start=\"3766\" data-end=\"3823\"\u003eCOSHH Regulation 9 Thorough Examination and Test (TExT)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3824\" data-end=\"3891\"\u003e\n\u003cp data-start=\"3826\" data-end=\"3891\"\u003eInvestigation of complaints, visible emissions, or odour issues\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3893\" data-end=\"4034\"\u003eIt aligns with the principle that \u003cstrong data-start=\"3927\" data-end=\"3975\"\u003eexhaust emissions must be captured at source\u003c\/strong\u003e, rather than relying on general ventilation or open doors.\u003c\/p\u003e\n\u003chr data-start=\"4036\" data-end=\"4039\"\u003e\n\u003ch2 data-start=\"4041\" data-end=\"4086\"\u003eImportant Professional Notes \u0026amp; Limitations\u003c\/h2\u003e\n\u003cp data-start=\"4088\" data-end=\"4154\"\u003eThis tool is provided as a \u003cstrong data-start=\"4115\" data-end=\"4153\"\u003ereference and calculation aid only\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul data-start=\"4156\" data-end=\"4420\"\u003e\n\u003cli data-start=\"4156\" data-end=\"4205\"\u003e\n\u003cp data-start=\"4158\" data-end=\"4205\"\u003eEvery effort has been made to minimise errors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4206\" data-end=\"4266\"\u003e\n\u003cp data-start=\"4208\" data-end=\"4266\"\u003eNo guarantee is given that the spreadsheet is error-free\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4267\" data-end=\"4307\"\u003e\n\u003cp data-start=\"4269\" data-end=\"4307\"\u003eNo liability is accepted for its use\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4308\" data-end=\"4373\"\u003e\n\u003cp data-start=\"4310\" data-end=\"4373\"\u003eUsers must understand the assumptions behind the calculations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4374\" data-end=\"4420\"\u003e\n\u003cp data-start=\"4376\" data-end=\"4420\"\u003eResults must be sense-checked and verified\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4422\" data-end=\"4458\"\u003eThe calculator does \u003cstrong data-start=\"4442\" data-end=\"4449\"\u003enot\u003c\/strong\u003e replace:\u003c\/p\u003e\n\u003cul data-start=\"4460\" data-end=\"4587\"\u003e\n\u003cli data-start=\"4460\" data-end=\"4495\"\u003e\n\u003cp data-start=\"4462\" data-end=\"4495\"\u003eA site-specific risk assessment\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4496\" data-end=\"4517\"\u003e\n\u003cp data-start=\"4498\" data-end=\"4517\"\u003eProper LEV design\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4518\" data-end=\"4559\"\u003e\n\u003cp data-start=\"4520\" data-end=\"4559\"\u003eCommissioning and performance testing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4560\" data-end=\"4587\"\u003e\n\u003cp data-start=\"4562\" data-end=\"4587\"\u003eProfessional competence\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4589\" data-end=\"4592\"\u003e\n\u003ch2 data-start=\"4594\" data-end=\"4618\"\u003eWhy This Tool Matters\u003c\/h2\u003e\n\u003cp data-start=\"4620\" data-end=\"4678\"\u003eIncorrectly sized vehicle exhaust LEV systems can lead to:\u003c\/p\u003e\n\u003cul data-start=\"4680\" data-end=\"4871\"\u003e\n\u003cli data-start=\"4680\" data-end=\"4741\"\u003e\n\u003cp data-start=\"4682\" data-end=\"4741\"\u003eOngoing exposure to carcinogenic diesel exhaust emissions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4742\" data-end=\"4780\"\u003e\n\u003cp data-start=\"4744\" data-end=\"4780\"\u003ePoor confidence in LEV performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4781\" data-end=\"4822\"\u003e\n\u003cp data-start=\"4783\" data-end=\"4822\"\u003eConflicting test results year-on-year\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4823\" data-end=\"4871\"\u003e\n\u003cp data-start=\"4825\" data-end=\"4871\"\u003eEnforcement, compliance, or audit challenges\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"4873\" data-end=\"5049\"\u003eThis calculator supports \u003cstrong data-start=\"4898\" data-end=\"4969\"\u003eclear thinking, transparent justification, and defensible decisions\u003c\/strong\u003e — whether you are designing, inspecting, or testing exhaust extraction systems.\u003c\/p\u003e\n\u003chr data-start=\"5051\" data-end=\"5054\"\u003e\n\u003ch2 data-start=\"5056\" data-end=\"5085\"\u003eWho This Calculator Is For\u003c\/h2\u003e\n\u003cp data-start=\"5087\" data-end=\"5119\"\u003eThis Excel tool is intended for:\u003c\/p\u003e\n\u003cul data-start=\"5121\" data-end=\"5315\"\u003e\n\u003cli data-start=\"5121\" data-end=\"5162\"\u003e\n\u003cp data-start=\"5123\" data-end=\"5162\"\u003eLEV engineers and COSHH Reg 9 testers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5163\" data-end=\"5190\"\u003e\n\u003cp data-start=\"5165\" data-end=\"5190\"\u003eOccupational hygienists\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5191\" data-end=\"5224\"\u003e\n\u003cp data-start=\"5193\" data-end=\"5224\"\u003eGarage and workshop designers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5225\" data-end=\"5258\"\u003e\n\u003cp data-start=\"5227\" data-end=\"5258\"\u003eHealth \u0026amp; safety professionals\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5259\" data-end=\"5315\"\u003e\n\u003cp data-start=\"5261\" data-end=\"5315\"\u003eDuty holders responsible for vehicle exhaust control\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"5317\" data-end=\"5441\"\u003eIt is particularly relevant for those working in \u003cstrong data-start=\"5366\" data-end=\"5440\"\u003egarages, depots, MOT stations, fleet workshops, and testing facilities\u003c\/strong\u003e.\u003c\/p\u003e\n\u003chr data-start=\"5443\" data-end=\"5446\"\u003e\n\u003ch2 data-start=\"5448\" data-end=\"5466\"\u003eProduct Details\u003c\/h2\u003e\n\u003cul data-start=\"5468\" data-end=\"5813\"\u003e\n\u003cli data-start=\"5468\" data-end=\"5535\"\u003e\n\u003cp data-start=\"5470\" data-end=\"5535\"\u003e\u003cstrong data-start=\"5470\" data-end=\"5482\"\u003eProduct:\u003c\/strong\u003e Vehicle Exhaust Emissions \u0026amp; LEV – Excel Calculator and notes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5536\" data-end=\"5579\"\u003e\n\u003cp data-start=\"5538\" data-end=\"5579\"\u003e\u003cstrong data-start=\"5538\" data-end=\"5549\"\u003eFormat:\u003c\/strong\u003e Microsoft Excel spreadsheet and PDF notes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5580\" data-end=\"5635\"\u003e\n\u003cp data-start=\"5582\" data-end=\"5635\"\u003e\u003cstrong data-start=\"5582\" data-end=\"5592\"\u003eFocus:\u003c\/strong\u003e Engine-matched exhaust extraction sizing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5636\" data-end=\"5687\"\u003e\n\u003cp data-start=\"5638\" data-end=\"5687\"\u003e\u003cstrong data-start=\"5638\" data-end=\"5651\"\u003eBased On:\u003c\/strong\u003e EGEA guidance, HSE HSG187, HSG258\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5688\" data-end=\"5746\"\u003e\n\u003cp data-start=\"5690\" data-end=\"5746\"\u003e\u003cstrong data-start=\"5690\" data-end=\"5703\"\u003eUse Case:\u003c\/strong\u003e LEV design, assessment, and TExT support\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5747\" data-end=\"5781\"\u003e\n\u003cp data-start=\"5749\" data-end=\"5781\"\u003e\u003cstrong data-start=\"5749\" data-end=\"5760\"\u003eAuthor:\u003c\/strong\u003e Louise Davies Wood\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"5782\" data-end=\"5813\"\u003e\n\u003cp data-start=\"5784\" data-end=\"5813\"\u003e\u003cstrong data-start=\"5784\" data-end=\"5796\"\u003eRelease:\u003c\/strong\u003e September 2025\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LEV Academy","offers":[{"title":"Default Title","offer_id":52700473098579,"sku":null,"price":25.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1017\/3313\/8771\/files\/Screenshot2026-01-01212228_b3eb3ad1-5e47-4d5f-9fe2-7e4272aa6425.png?v=1767302774"},{"product_id":"useful-excel-calculator-foundry-canopy-hood-design","title":"Useful Excel Calculator - Foundry canopy hood design (Rectangular and Circular hoods)","description":"\u003cp data-end=\"516\" data-start=\"296\"\u003eDesigning canopy hoods for hot processes is a routine part of LEV work in foundries and heavy industry — yet it’s also an area where \u003cstrong data-end=\"515\" data-start=\"429\"\u003esmall assumptions or rushed calculations can lead to significant under-performance\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-end=\"719\" data-start=\"518\"\u003eEstimating buoyant plume flow.\u003cbr\u003eAllowing for plume spread with hood height.\u003cbr\u003eTranslating ACGIH equations into practical hood sizes and airflow rates.\u003cbr\u003eSense-checking results under design or site pressure.\u003c\/p\u003e\n\u003cp data-end=\"987\" data-start=\"721\"\u003eThe \u003cstrong data-end=\"782\" data-start=\"725\"\u003eCanopy Hood Sizing Excel Calculator for Hot Processes\u003c\/strong\u003e was created as a \u003cstrong data-end=\"826\" data-start=\"800\"\u003epractical support tool\u003c\/strong\u003e for LEV practitioners who want a structured, transparent way to size canopy hoods while retaining full ownership of the engineering judgement behind the design.\u003c\/p\u003e\n\u003cp data-end=\"1170\" data-start=\"989\"\u003eThis is \u003cstrong data-end=\"1027\" data-start=\"997\"\u003enot a black-box calculator\u003c\/strong\u003e. It is a \u003cstrong data-end=\"1071\" data-start=\"1037\"\u003eclear, formula-based worksheet\u003c\/strong\u003e that mirrors the ACGIH Industrial Ventilation Manual methodology used in everyday LEV design work.\u003c\/p\u003e\n\u003chr data-end=\"1175\" data-start=\"1172\"\u003e\n\u003ch2 data-end=\"1229\" data-start=\"1177\"\u003eA Simple, Structured Canopy Hood Calculation Tool\u003c\/h2\u003e\n\u003cp data-end=\"1424\" data-start=\"1231\"\u003eThe calculator is laid out to follow the logical steps used when sizing canopy (receiving) hoods over hot processes, including furnaces, molten metal operations, and high-temperature equipment.\u003c\/p\u003e\n\u003ch3 data-end=\"1455\" data-start=\"1426\"\u003eCore Calculations Covered\u003c\/h3\u003e\n\u003cp data-end=\"1552\" data-start=\"1457\"\u003eThe spreadsheet guides the user through the key parameters influencing canopy hood performance:\u003c\/p\u003e\n\u003cp data-end=\"1659\" data-start=\"1554\"\u003e\u003cstrong data-end=\"1588\" data-start=\"1554\"\u003eHypothetical source dimensions\u003c\/strong\u003e\u003cbr data-end=\"1591\" data-start=\"1588\"\u003eBased on source size and hood elevation, reflecting plume expansion.\u003c\/p\u003e\n\u003cp data-end=\"1776\" data-start=\"1661\"\u003e\u003cstrong data-end=\"1692\" data-start=\"1661\"\u003eTemperature difference (ΔT)\u003c\/strong\u003e\u003cbr data-end=\"1695\" data-start=\"1692\"\u003eCapturing the effect of buoyancy driven by hot processes relative to ambient air.\u003c\/p\u003e\n\u003cp data-end=\"1858\" data-start=\"1778\"\u003e\u003cstrong data-end=\"1804\" data-start=\"1778\"\u003eSource-induced airflow\u003c\/strong\u003e\u003cbr data-end=\"1807\" data-start=\"1804\"\u003eEstimating plume flow generated by thermal updraft.\u003c\/p\u003e\n\u003cp data-end=\"2019\" data-start=\"1860\"\u003e\u003cstrong data-end=\"1895\" data-start=\"1860\"\u003eTotal required hood airflow (Q)\u003c\/strong\u003e\u003cbr data-end=\"1898\" data-start=\"1895\"\u003eCalculating the volumetric flowrate required at the hood face, including allowance for entrainment and practical capture.\u003c\/p\u003e\n\u003cp data-end=\"2127\" data-start=\"2021\"\u003e\u003cstrong data-end=\"2048\" data-start=\"2021\"\u003eMinimum hood dimensions\u003c\/strong\u003e\u003cbr data-end=\"2051\" data-start=\"2048\"\u003eEnsuring the canopy hood is sized to intercept the full plume at hood level.\u003c\/p\u003e\n\u003cp data-end=\"2215\" data-start=\"2129\"\u003eBoth \u003cstrong data-end=\"2173\" data-start=\"2134\"\u003erectangular and cylindrical sources\u003c\/strong\u003e can be assessed using the same framework.\u003c\/p\u003e\n\u003chr data-end=\"2220\" data-start=\"2217\"\u003e\n\u003ch2 data-end=\"2271\" data-start=\"2222\"\u003eBased on ACGIH Industrial Ventilation Guidance\u003c\/h2\u003e\n\u003cp data-end=\"2475\" data-start=\"2273\"\u003eThe calculations are aligned with the methodology set out in the \u003cstrong data-end=\"2415\" data-start=\"2338\"\u003eACGIH Industrial Ventilation: A Manual of Recommended Practice for Design\u003c\/strong\u003e, widely regarded as the benchmark reference for LEV design.\u003c\/p\u003e\n\u003cp data-end=\"2626\" data-start=\"2477\"\u003eThis calculator converts the published equations into a usable, repeatable format — reducing manual manipulation while maintaining full transparency.\u003c\/p\u003e\n\u003chr data-end=\"2631\" data-start=\"2628\"\u003e\n\u003ch2 data-end=\"2685\" data-start=\"2633\"\u003eDesigned for Reliability — Not Accidental Changes\u003c\/h2\u003e\n\u003cp data-end=\"2737\" data-start=\"2687\"\u003eTo support consistent and defensible calculations:\u003c\/p\u003e\n\u003cul data-end=\"2847\" data-start=\"2739\"\u003e\n\u003cli data-end=\"2771\" data-start=\"2739\"\u003e\n\u003cp data-end=\"2771\" data-start=\"2741\"\u003eAll formula cells are locked\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2810\" data-start=\"2772\"\u003e\n\u003cp data-end=\"2810\" data-start=\"2774\"\u003eInput cells are clearly identified\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2847\" data-start=\"2811\"\u003e\n\u003cp data-end=\"2847\" data-start=\"2813\"\u003eThe worksheet structure is fixed\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2956\" data-start=\"2849\"\u003eThis prevents accidental overwriting and ensures the calculator behaves the same way every time it is used.\u003c\/p\u003e\n\u003chr data-end=\"2961\" data-start=\"2958\"\u003e\n\u003ch2 data-end=\"2993\" data-start=\"2963\"\u003eImportant Professional Note\u003c\/h2\u003e\n\u003cp data-end=\"3048\" data-start=\"2995\"\u003eThis calculator is provided as a \u003cstrong data-end=\"3047\" data-start=\"3028\"\u003edesign aid only\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-end=\"3203\" data-start=\"3050\"\u003eWhile care has been taken to implement the formulas correctly, no guarantee can be given that the spreadsheet is free from errors. Users are expected to:\u003c\/p\u003e\n\u003cul data-end=\"3372\" data-start=\"3205\"\u003e\n\u003cli data-end=\"3252\" data-start=\"3205\"\u003e\n\u003cp data-end=\"3252\" data-start=\"3207\"\u003eUnderstand the underlying ACGIH methodology\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3280\" data-start=\"3253\"\u003e\n\u003cp data-end=\"3280\" data-start=\"3255\"\u003eSense-check all outputs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3326\" data-start=\"3281\"\u003e\n\u003cp data-end=\"3326\" data-start=\"3283\"\u003eVerify results manually where appropriate\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3372\" data-start=\"3327\"\u003e\n\u003cp data-end=\"3372\" data-start=\"3329\"\u003eApply professional judgement at all times\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"3515\" data-start=\"3374\"\u003eNo responsibility is accepted for decisions made solely on the basis of the calculator output. Feedback on any identified errors is welcomed.\u003c\/p\u003e\n\u003chr data-end=\"3520\" data-start=\"3517\"\u003e\n\u003ch2 data-end=\"3546\" data-start=\"3522\"\u003eWhy This Tool Matters\u003c\/h2\u003e\n\u003cp data-end=\"3600\" data-start=\"3548\"\u003eIn hot process LEV design, small errors can lead to:\u003c\/p\u003e\n\u003cul data-end=\"3818\" data-start=\"3602\"\u003e\n\u003cli data-end=\"3629\" data-start=\"3602\"\u003e\n\u003cp data-end=\"3629\" data-start=\"3604\"\u003eUndersized canopy hoods\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3669\" data-start=\"3630\"\u003e\n\u003cp data-end=\"3669\" data-start=\"3632\"\u003eInadequate capture of buoyant fumes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3730\" data-start=\"3670\"\u003e\n\u003cp data-end=\"3730\" data-start=\"3672\"\u003eExcessive heat and contaminant escape into the workspace\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3775\" data-start=\"3731\"\u003e\n\u003cp data-end=\"3775\" data-start=\"3733\"\u003eOver- or under-specified exhaust systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3818\" data-start=\"3776\"\u003e\n\u003cp data-end=\"3818\" data-start=\"3778\"\u003eDifficult-to-defend design assumptions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"3990\" data-start=\"3820\"\u003eThis calculator helps \u003cstrong data-end=\"3871\" data-start=\"3842\"\u003ereduce avoidable mistakes\u003c\/strong\u003e, improve consistency, and support clearer design thinking — while keeping responsibility firmly with the practitioner.\u003c\/p\u003e\n\u003chr data-end=\"3995\" data-start=\"3992\"\u003e\n\u003ch2 data-end=\"4026\" data-start=\"3997\"\u003eWho This Calculator Is For\u003c\/h2\u003e\n\u003cp data-end=\"4066\" data-start=\"4028\"\u003eThis Excel calculator is suitable for:\u003c\/p\u003e\n\u003cul data-end=\"4276\" data-start=\"4068\"\u003e\n\u003cli data-end=\"4099\" data-start=\"4068\"\u003e\n\u003cp data-end=\"4099\" data-start=\"4070\"\u003eLEV engineers and designers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4138\" data-start=\"4100\"\u003e\n\u003cp data-end=\"4138\" data-start=\"4102\"\u003eIndustrial ventilation consultants\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4166\" data-start=\"4139\"\u003e\n\u003cp data-end=\"4166\" data-start=\"4141\"\u003eOccupational hygienists\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4218\" data-start=\"4167\"\u003e\n\u003cp data-end=\"4218\" data-start=\"4169\"\u003eFoundry and heavy-industry safety professionals\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4276\" data-start=\"4219\"\u003e\n\u003cp data-end=\"4276\" data-start=\"4221\"\u003eTrainee LEV practitioners learning canopy hood design\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"4416\" data-start=\"4278\"\u003eIt is particularly useful when working with \u003cstrong data-end=\"4356\" data-start=\"4322\"\u003ehot, buoyancy-driven processes\u003c\/strong\u003e where receiving hoods are the appropriate control strategy.\u003c\/p\u003e\n\u003chr data-end=\"4421\" data-start=\"4418\"\u003e\n\u003ch2 data-end=\"4441\" data-start=\"4423\"\u003eProduct Details\u003c\/h2\u003e\n\u003cp data-end=\"4821\" data-start=\"4443\"\u003e\u003cstrong data-end=\"4455\" data-start=\"4443\"\u003eProduct:\u003c\/strong\u003e Canopy Hood Sizing Excel Calculator for Hot Processes\u003cbr data-end=\"4512\" data-start=\"4509\"\u003e\u003cstrong data-end=\"4523\" data-start=\"4512\"\u003eFormat:\u003c\/strong\u003e Microsoft Excel spreadsheet (.xlsx)\u003cbr data-end=\"4562\" data-start=\"4559\"\u003e\u003cstrong data-end=\"4585\" data-start=\"4562\"\u003eCalculation Method:\u003c\/strong\u003e ACGIH Industrial Ventilation (canopy hoods over hot processes)\u003cbr data-end=\"4651\" data-start=\"4648\"\u003e\u003cstrong data-end=\"4664\" data-start=\"4651\"\u003eFormulas:\u003c\/strong\u003e Locked to prevent accidental editing\u003cbr data-end=\"4704\" data-start=\"4701\"\u003e\u003cstrong data-end=\"4717\" data-start=\"4704\"\u003eUse Case:\u003c\/strong\u003e LEV design, design verification, training, and airflow justification\u003cbr data-end=\"4789\" data-start=\"4786\"\u003e\u003cstrong data-end=\"4800\" data-start=\"4789\"\u003eAuthor:\u003c\/strong\u003e Louise Davies Wood\u003c\/p\u003e","brand":"LEV Academy","offers":[{"title":"Default Title","offer_id":52953050546515,"sku":null,"price":25.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1017\/3313\/8771\/files\/Screenshot2026-02-04200522.png?v=1770235625"}],"url":"https:\/\/www.levacademy.co.uk\/collections\/excel-calculators.oembed","provider":"LEV Academy","version":"1.0","type":"link"}