{"id":23250,"date":"2025-12-18T10:38:07","date_gmt":"2025-12-18T10:38:07","guid":{"rendered":"https:\/\/smartairfilters.com\/uk\/?p=23250"},"modified":"2025-12-18T10:41:51","modified_gmt":"2025-12-18T10:41:51","slug":"chepa-calculator","status":"publish","type":"post","link":"https:\/\/smartairfilters.com\/uk\/en\/chepa-calculator\/","title":{"rendered":"What the CHEPA Calculator tells us about HEPA filters in UK primary classrooms"},"content":{"rendered":"\n<p>Imperial College London has released the <span style=\"text-decoration: underline\"><a href=\"https:\/\/www.coschools.org.uk\/CHEPAcalculator\" target=\"_blank\" rel=\"noreferrer noopener\">CHEPA (Classroom HEPA) calculator<\/a><\/span>, a tool designed to help schools understand how HEPA air filtration might reduce airborne particles and infection risk in classrooms.<\/p>\n\n\n\n<p>We spent some time exploring the calculator using realistic UK primary classroom assumptions and varying only the things schools can actually control - <strong>airflow (CADR) and building leakiness<\/strong> <strong>(draughty)<\/strong>. Below are our impressions: what we found useful, where the tool is less helpful, and how much weight we think schools should place on the results.<\/p>\n\n\n\n<figure class=\"gb-block-image gb-block-image-9382c1f7\"><img loading=\"lazy\" decoding=\"async\" width=\"1272\" height=\"716\" class=\"gb-image gb-image-9382c1f7\" src=\"https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/16\/2025\/12\/CHEPA-1.png\" alt=\"\" title=\"CHEPA\" srcset=\"https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/16\/2025\/12\/CHEPA-1.png 1272w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/16\/2025\/12\/CHEPA-1-300x169.png 300w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/16\/2025\/12\/CHEPA-1-1024x576.png 1024w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/16\/2025\/12\/CHEPA-1-768x432.png 768w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/16\/2025\/12\/CHEPA-1-600x338.png 600w\" sizes=\"auto, (max-width: 1272px) 100vw, 1272px\" \/><\/figure>\n\n\n\n<div style=\"height:14px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>What we liked<\/strong><\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">1. It shows <em>how much airflow matters<\/em><\/h5>\n\n\n\n<p>One of the clearest messages from the calculator is that fan speed (or CADR) matters just as much as having a HEPA filter at all. Using the same classroom assumptions and varying only how air tight a classroom is:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>At higher airflow, the calculator suggests approximately 77\u201382% reduction in respiratory aerosols and 85\u201390% reduction in particulate matter, depending on building airtightness.<\/li>\n\n\n\n<li>At lower airflow, reductions fall to approximately 57\u201364% for respiratory aerosols and 70\u201378% for particulate matter.<\/li>\n<\/ul>\n\n\n\n<p>This reflects a reality schools often discover too late: <strong>if an air cleaner has to be run on lower speeds, its impact will be smaller.<\/strong> The calculator makes that trade-off visible.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">2. It distinguishes between particles and infection risk<\/h5>\n\n\n\n<p>We appreciated that CHEPA does <strong>not<\/strong> treat \u201cclean air\u201d as a single concept. The calculator separately estimates:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Reduction in particulate matter (PM)<\/li>\n\n\n\n<li>Reduction in respiratory aerosols and infection risk<\/li>\n<\/ul>\n\n\n\n<p>These are related but not the same. Viruses are not floating around on their own; they are carried in tiny respiratory aerosols. HEPA filters don\u2019t \u201ccatch viruses\u201d, but they <em>do<\/em> remove the aerosol particles that carry them. The calculator reflects this by showing consistently lower infection-risk reduction than PM reduction, which feels realistic and responsible.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">3. It highlights where HEPA adds the most value<\/h5>\n\n\n\n<p>Another useful insight is how strongly results depend on how airtight a classroom is.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In more sealed classrooms, HEPA filtration delivers larger relative reductions<\/li>\n\n\n\n<li>In draughty classrooms, natural air leakage already dilutes aerosols, so the additional benefit is smaller<\/li>\n<\/ul>\n\n\n\n<p>That may sound counterintuitive, but it makes sense. It also helps explain why HEPA filters may feel transformative in some rooms and underwhelming in others.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>What can be made clearer<\/strong><\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">Some questions won\u2019t map cleanly onto every classroom<\/h5>\n\n\n\n<p>While the calculator is careful to label its outputs as <em>approximate<\/em>, some of the input questions are necessarily generalised and may not reflect all classrooms within the same school equally well.<\/p>\n\n\n\n<p>Older buildings, temporary or pre-fabricated classrooms, and rooms that behave very differently thermally or aerodynamically may not fit neatly into options such as \u201crelatively well-insulated\u201d or \u201cdraughty\u201d. In those cases, the model can still be informative, but perhaps there should be caution in over-interpreting the results.<\/p>\n\n\n\n<p>This isn\u2019t a flaw so much as a reminder that the calculator is a simplified representation of complex buildings, and local knowledge still matters.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">2. Energy impacts are relative and can be misread<\/h5>\n\n\n\n<p>The calculator includes an \u201cenergy consumption\u201d output, which is helpful in principle, but it\u2019s easy to misinterpret.<\/p>\n\n\n\n<p>What it\u2019s really showing is:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Airtight rooms retain heat better<\/li>\n\n\n\n<li>Running air filtration in those rooms has a higher <em>relative<\/em> energy impact<\/li>\n\n\n\n<li>Draughty rooms lose heat anyway, so the <em>incremental<\/em> impact looks smaller<\/li>\n<\/ul>\n\n\n\n<p>Without context, this could be misread as \u201cHEPA wastes energy\u201d, rather than \u201cbuilding fabric matters\u201d.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">3. Behaviour and noise are missing from the model<\/h5>\n\n\n\n<p>Two of the biggest real-world constraints on HEPA performance are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>How noisy a unit can be before it\u2019s turned down<\/li>\n\n\n\n<li>How consistently it\u2019s actually left running<\/li>\n<\/ul>\n\n\n\n<p>The calculator can\u2019t account for this, but it\u2019s worth flagging prominently. A unit run sold based on CADR at high speed but consistently turned down to the lowest speed will not perform as well as anticipated.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>What this means for schools<\/strong><\/h4>\n\n\n\n<p>HEPA filtration almost always reduces respiratory aerosols, but the scale of that benefit depends on how aerosols would otherwise accumulate in a room.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Rooms with limited or no window opening<\/li>\n\n\n\n<li>High and continuous occupancy<\/li>\n\n\n\n<li>Long lesson blocks<\/li>\n\n\n\n<li>Winter conditions where ventilation is restricted<\/li>\n<\/ul>\n\n\n\n<p>In spaces where dilution through ventilation is limited, inconsistent, or constrained by comfort or outdoor air quality, HEPA can play a significant role in reducing airborne exposure. In other rooms, HEPA filtration can still support overall indoor air quality by reducing fine particles, even where ventilation is generally good.<\/p>\n\n\n\n<p>We like the CHEPA calculator because, used thoughtfully, it\u2019s a helpful decision-support tool<\/p>\n\n\n\n<p class=\"has-small-font-size\"><strong>Footnote:<\/strong><br>All scenarios were based on a typical UK primary classroom (60\u201380 m\u00b2, 2.5\u20133 m ceilings, 21\u201330 pupils, age 5-11, 1 external wall, 1 gas radiator, less than one device per two pupils) with variations in building airtightness and clean air delivery rate (CADR).<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Imperial College London has released the CHEPA (Classroom HEPA) calculator, a tool designed to help schools understand how HEPA air filtration might reduce airborne particles and infection risk in classrooms. We spent some time exploring the calculator using realistic UK primary classroom assumptions and varying only the things schools can actually control - airflow (CADR) ... <a title=\"What the CHEPA Calculator tells us about HEPA filters in UK primary classrooms\" class=\"read-more\" href=\"https:\/\/smartairfilters.com\/uk\/en\/chepa-calculator\/\" aria-label=\"Read more about What the CHEPA Calculator tells us about HEPA filters in UK primary classrooms\">Read more<\/a><\/p>\n","protected":false},"author":10355,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-23250","post","type-post","status-publish","format-standard","hentry","category-slider"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Smart Air UK<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:site_name\" content=\"Smart Air UK\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/smartairfilters\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-18T10:38:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-18T10:41:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/16\/2025\/12\/CHEPA-1.png\" \/>\n<meta name=\"author\" content=\"smartairuk\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:description\" content=\"Imperial College London has released the CHEPA (Classroom HEPA) calculator, a tool designed to help schools understand how HEPA air filtration might reduce airborne particles and infection risk in classrooms. 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