<div class='ui dimmer modals page' style='display: none;'><div id='helpie-password-modal' class='pauple_helpie ui modal small' style='display: none;'><div class='ui header'><i class='circular lock icon'></i> Password Protected</div><div class='item-content'><br /><label for='password_check'>Enter Password : </label><p><input type='password' id='password_check' name='password_check' class='password' value='' required></p></div><div class='actions'><div class='ui black deny button'>Nope</div><div class='ui positive right labeled icon button'>Yep, that's right!<i class='checkmark icon'></i></div></div><div class='clear'></div></div></div>{"id":4213,"date":"2020-02-20T02:45:15","date_gmt":"2020-02-20T02:45:15","guid":{"rendered":"https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/how-is-the-hepas-lifespan-calculated\/"},"modified":"2022-02-07T17:08:58","modified_gmt":"2022-02-07T09:08:58","slug":"how-is-the-hepas-lifespan-calculated","status":"publish","type":"pauple_helpie","link":"https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/how-is-the-hepas-lifespan-calculated\/","title":{"rendered":"How is a HEPA Filter&#8217;s Lifespan Calculated?"},"content":{"rendered":"<div class='breadcrumbs pauple_helpie_breadcrumbs'><a class='mainpage-link' href='https:\/\/smartairfilters.com\/learn\/'>Knowledge Base<\/a> <span class='helpiekb_separator'> &nbsp;&nbsp; <i class='fa fa-angle-right' aria-hidden='true'><\/i>&nbsp;&nbsp;<\/span><a class='mainpage-link' href='https:\/\/smartairfilters.com\/learn\/cat\/smart-air-purifiers\/'>Smart Air Purifiers<\/a> <span class='helpiekb_separator'> &nbsp;&nbsp; <i class='fa fa-angle-right' aria-hidden='true'><\/i>&nbsp;&nbsp;<\/span><a class='mainpage-link' href='https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/how-is-the-hepas-lifespan-calculated\/'>How is a HEPA Filter's Lifespan Calculated?<\/a> <\/div>\n<p>There are two methods to calculate how long a HEPA filter lasts. One is to do real-world tests in a representative environment of where the HEPA filter will be used. The other is to use the &#8216;CCM&#8217; method.<\/p>\n\n\n\n<p>For real world tests at Smart Air, we run each of air purifiers in real-world air in Beijing, China for a period of months (100-200 days). We then test the HEPA efficiency on a daily or weekly basis, and calculate the drop in effectiveness over time. For more information on this testing method, see our article on the <a href=\"https:\/\/smartairfilters.com\/en\/blog\/sqair-hepa-lifespan-test\/\">Sqair HEPA filter&#8217;s lifespan<\/a>.<\/p>\n\n\n\n<p>The CCM method makes use of the GB18801 air purifier standard. A HEPA filter is subjected to large amounts of PM2.5, then continually tested until the air purifier&#8217;s CADR drops by 50%. This is then considered the &#8216;time&#8217; to replace your HEPA filter.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">When Should Change My HEPA Filter?<\/h4>\n\n\n\n<p>In reality, everybody&#8217;s air purifier usage is different, and the amount of pollution in the air changed depending on where you live. That&#8217;s why we&#8217;ve created a <a href=\"https:\/\/smartairfilters.com\/en\/when-change-hepa-filter\/\">handy tool to know when to change your HEPA filter<\/a>.<\/p>\n<div class='pauple-helpie-module article-voting'><span class='label'>Was this article useful?<\/span><span data-post-id='4213' data-user-id='0' class='icon-tray'><span  data-vote='thumbs up outline' class=' voting-icon thumbs up outline '><i data-content='thumbs up outline' class='thumbs up outline outline icon' aria-hidden='true'><\/i><count>0<\/count><\/span><span  data-vote='thumbs down outline' class=' voting-icon thumbs down outline '><i data-content='thumbs down outline' class='thumbs down outline outline icon' aria-hidden='true'><\/i><count>3<\/count><\/span><\/span><\/div><div style='clear:both;'><\/div>","protected":false},"excerpt":{"rendered":"<p>Knowledge Base &nbsp;&nbsp; &nbsp;&nbsp;Smart Air Purifiers &nbsp;&nbsp; &nbsp;&nbsp;How is a HEPA Filter&#8217;s Lifespan Calculated? There are two methods to calculate how long a HEPA filter lasts. One is to do real-world tests in a representative environment of where the HEPA filter will be used. The other is to use the &#8230; <a title=\"How is a HEPA Filter&#8217;s Lifespan Calculated?\" class=\"read-more\" href=\"https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/how-is-the-hepas-lifespan-calculated\/\" aria-label=\"Read more about How is a HEPA Filter&#8217;s Lifespan Calculated?\">Read more<\/a><\/p>\n","protected":false},"author":4824,"featured_media":0,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","format":"standard","meta":{"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","footnotes":""},"helpdesk_category":[603],"helpie_tag":[445,225,462,146,262,75,461,125,126,178,350],"helpie_add_tag":[],"helpie_up_tag":[],"class_list":["post-4213","pauple_helpie","type-pauple_helpie","status-publish","format-standard","hentry","helpdesk_category-smart-air-purifiers","helpie_tag-calculated","helpie_tag-data","helpie_tag-days","helpie_tag-effectiveness","helpie_tag-filter","helpie_tag-hepa","helpie_tag-hours","helpie_tag-how-long","helpie_tag-lifespan","helpie_tag-test","helpie_tag-time"],"_links":{"self":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/4213","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie"}],"about":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/types\/pauple_helpie"}],"author":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/users\/4824"}],"replies":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/comments?post=4213"}],"version-history":[{"count":3,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/4213\/revisions"}],"predecessor-version":[{"id":5758,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/4213\/revisions\/5758"}],"wp:attachment":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/media?parent=4213"}],"wp:term":[{"taxonomy":"helpdesk_category","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpdesk_category?post=4213"},{"taxonomy":"helpie_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_tag?post=4213"},{"taxonomy":"helpie_add_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_add_tag?post=4213"},{"taxonomy":"helpie_up_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_up_tag?post=4213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}