<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":5354,"date":"2021-02-07T10:49:15","date_gmt":"2021-02-07T02:49:15","guid":{"rendered":"https:\/\/smartairfilters.com\/learn\/?post_type=pauple_helpie&#038;p=5354"},"modified":"2021-02-07T10:50:29","modified_gmt":"2021-02-07T02:50:29","slug":"if-a-purifier-has-a-99-99-efficiency-hepa-filter-shouldnt-its-cadr-be-equal-to-the-airflow","status":"publish","type":"pauple_helpie","link":"https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/if-a-purifier-has-a-99-99-efficiency-hepa-filter-shouldnt-its-cadr-be-equal-to-the-airflow\/","title":{"rendered":"If a Purifier Has a 99.99% Efficiency HEPA Filter, Shouldn\u2019t Its CADR Be Equal to the Airflow?"},"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\/protecting-yourself\/'>Protecting Yourself<\/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\/air-purifiers\/'>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\/if-a-purifier-has-a-99-99-efficiency-hepa-filter-shouldnt-its-cadr-be-equal-to-the-airflow\/'>If a Purifier Has a 99.99% Efficiency HEPA Filter, Shouldn\u2019t Its CADR Be Equal to the Airflow?<\/a> <\/div><p>The CADR rating of an air purifier takes into account inefficiencies with the air purifier due to cleaning air that had recently already been cleaned.<\/p>\n<p>Think about it this way: an air purifier designed in a loop that directs all clean air coming out of the air purifier back into the air purifier would not do a great job at cleaning a room, even though the HEPA filter is 99.99% effective.<\/p>\n<p>Learn more about: <span><a href=\"https:\/\/smartairfilters.com\/en\/blog\/cadr-airflow-difference\/\">The difference between CADR and airflow \u00bb<\/a><\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<div class='pauple-helpie-module article-voting'><span class='label'>Was this article useful?<\/span><span data-post-id='5354' 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>1<\/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>2<\/count><\/span><\/span><\/div><div style='clear:both;'><\/div>","protected":false},"excerpt":{"rendered":"<p>Knowledge Base &nbsp;&nbsp; &nbsp;&nbsp;Protecting Yourself &nbsp;&nbsp; &nbsp;&nbsp;Air Purifiers &nbsp;&nbsp; &nbsp;&nbsp;If a Purifier Has a 99.99% Efficiency HEPA Filter, Shouldn\u2019t Its CADR Be Equal to the Airflow? The CADR rating of an air purifier takes into account inefficiencies with the air purifier due to cleaning air that had recently already been &#8230; <a title=\"If a Purifier Has a 99.99% Efficiency HEPA Filter, Shouldn\u2019t Its CADR Be Equal to the Airflow?\" class=\"read-more\" href=\"https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/if-a-purifier-has-a-99-99-efficiency-hepa-filter-shouldnt-its-cadr-be-equal-to-the-airflow\/\" aria-label=\"Read more about If a Purifier Has a 99.99% Efficiency HEPA Filter, Shouldn\u2019t Its CADR Be Equal to the Airflow?\">Read more<\/a><\/p>\n","protected":false},"author":7807,"featured_media":0,"menu_order":0,"comment_status":"open","ping_status":"closed","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":[673,613],"helpie_tag":[266,239,145,357,236,164,76],"helpie_add_tag":[],"helpie_up_tag":[],"class_list":["post-5354","pauple_helpie","type-pauple_helpie","status-publish","format-standard","hentry","helpdesk_category-air-purifiers","helpdesk_category-protecting-yourself","helpie_tag-air-purifier","helpie_tag-airflow","helpie_tag-cadr","helpie_tag-calculate","helpie_tag-difference","helpie_tag-efficiency","helpie_tag-hepa-filter"],"_links":{"self":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/5354","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\/7807"}],"replies":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/comments?post=5354"}],"version-history":[{"count":2,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/5354\/revisions"}],"predecessor-version":[{"id":5356,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/5354\/revisions\/5356"}],"wp:attachment":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/media?parent=5354"}],"wp:term":[{"taxonomy":"helpdesk_category","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpdesk_category?post=5354"},{"taxonomy":"helpie_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_tag?post=5354"},{"taxonomy":"helpie_add_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_add_tag?post=5354"},{"taxonomy":"helpie_up_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_up_tag?post=5354"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}