<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":4257,"date":"2020-02-20T02:45:18","date_gmt":"2020-02-20T02:45:18","guid":{"rendered":"https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/does-the-hepa-have-a-front-and-back-side\/"},"modified":"2022-03-11T12:47:57","modified_gmt":"2022-03-11T04:47:57","slug":"hepa-filter-front-back-direction-right-way","status":"publish","type":"pauple_helpie","link":"https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/hepa-filter-front-back-direction-right-way\/","title":{"rendered":"Do HEPA Filters Have a Front and Back Side?"},"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\/hepa-filter-front-back-direction-right-way\/'>Do HEPA Filters Have a Front and Back Side?<\/a> <\/div>\n<p>Yes, HEPA filters have a front and back. Make sure to follow the instructions on the HEPA filter when inserting or attaching the filter to your air purifier.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"551\" height=\"367\" src=\"https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2022\/03\/qt3-air-purifier-hepa-filters.jpg\" alt=\"\" class=\"wp-image-5767\" srcset=\"https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2022\/03\/qt3-air-purifier-hepa-filters.jpg 551w, https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/9\/2022\/03\/qt3-air-purifier-hepa-filters-300x200.jpg 300w\" sizes=\"auto, (max-width: 551px) 100vw, 551px\" \/><figcaption>Arrow showing the front and back of the HEPA Filter for the <a href=\"https:\/\/smartairfilters.com\/product\/qt3-portable-air-purifier\/\">QT3 air purifier<\/a><\/figcaption><\/figure><\/div>\n\n\n\n<h3 class=\"gb-headline gb-headline-8ac5a12f gb-headline-text\">What Happens if I Insert the HEPA Filter the Other Way in My Air Purifier?<\/h3>\n\n\n\n<p>HEPA filters have a certain direction for airflow, because one side of the HEPA filter is specially treated to improve airflow performance. Inserting the HEPA filter in the wrong direction may lead to slightly lower filtration performance of the HEPA filter.<\/p>\n\n\n\n<p><a href=\"https:\/\/smartairfilters.com\/en\/product-category\/hepa-filters\/\">Learn more about our range of simple, no-nonsense HEPA filters \u00bb<\/a><\/p>\n<div class='pauple-helpie-module article-voting'><span class='label'>Was this article useful?<\/span><span data-post-id='4257' 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>9<\/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>20<\/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;Do HEPA Filters Have a Front and Back Side? Yes, HEPA filters have a front and back. Make sure to follow the instructions on the HEPA filter when inserting or attaching the filter to your air purifier. What Happens if I Insert the &#8230; <a title=\"Do HEPA Filters Have a Front and Back Side?\" class=\"read-more\" href=\"https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/hepa-filter-front-back-direction-right-way\/\" aria-label=\"Read more about Do HEPA Filters Have a Front and Back Side?\">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":[400,309,75,399],"helpie_add_tag":[],"helpie_up_tag":[],"class_list":["post-4257","pauple_helpie","type-pauple_helpie","status-publish","format-standard","hentry","helpdesk_category-smart-air-purifiers","helpie_tag-back","helpie_tag-front","helpie_tag-hepa","helpie_tag-side"],"_links":{"self":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/4257","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=4257"}],"version-history":[{"count":6,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/4257\/revisions"}],"predecessor-version":[{"id":5768,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/4257\/revisions\/5768"}],"wp:attachment":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/media?parent=4257"}],"wp:term":[{"taxonomy":"helpdesk_category","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpdesk_category?post=4257"},{"taxonomy":"helpie_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_tag?post=4257"},{"taxonomy":"helpie_add_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_add_tag?post=4257"},{"taxonomy":"helpie_up_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_up_tag?post=4257"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}