{"id":5573,"date":"2021-08-23T13:30:36","date_gmt":"2021-08-23T05:30:36","guid":{"rendered":"https:\/\/smartairfilters.com\/learn\/?post_type=pauple_helpie&p=5573"},"modified":"2021-08-24T16:44:50","modified_gmt":"2021-08-24T08:44:50","slug":"purifier-cadr-800m3-450cfm-measure-reliable","status":"publish","type":"pauple_helpie","link":"https:\/\/smartairfilters.com\/learn\/smart-air-knowledge-base\/purifier-cadr-800m3-450cfm-measure-reliable\/","title":{"rendered":"Why Can\u2019t CADR Values over 800m^{3<\/sup>\/hr or 450cfm Be Measured Reliably?"},"content":{"rendered":"Knowledge Base<\/a> <\/i> <\/span>Protecting Yourself<\/a> <\/i> <\/span>Air Purifiers<\/a> <\/i> <\/span>Why Can\u2019t CADR Values over 800m^{3<\/sup>\/hr or 450cfm Be Measured Reliably?<\/a> <\/div>\n}The CADR test is an\u00a0industry standard number<\/a>\u00a0to compare the performance of air purifiers. There are\u00a0two common standards<\/a>\u00a0for measuring CADR, they are\u00a0the AHAM AC-1 standard in the US, or the GB 18801-2015 standard in China.
Both these standards test air purifiers in an empty room of average size. That’s 30m^{3<\/sup> for GB 18801 and 1008ft^{3<\/sup> or 28.3m^{3<\/sup> for the AHAM standard.<\/p>\n\n\n\n}}}
When purifiers that are designed for much larger spaces are tested in this standard room size, they clean the entire air in the room extremely quickly, often in fewer than 5 minutes. With air being cleaned so quickly, there is no way to use the standard CADR formula to calculate a CADR value for the purifier. As such, CADR values are limited by the standard size of the testing room, and the formula and method in which CADR is calculated.<\/p>\n\n\n\n
For the China GB 18801-2015, the maximum CADR value that can be tested is 800m^{3<\/sup>\/hr\uff1b<\/p>\n\n\n\n}
For the AHAM AC-1, the maximum CADR value that can be tested is 400cfm (680m^{3<\/sup>\/hr) for dust, and 450cfm (764m^{3<\/sup>\/hr) for pollen and cigarette smoke.<\/p>\n\n\n\n}}
Here are the specifications from the AHAM AC-1 standard:<\/p>\n\n\n\n
<\/figure>\n\n\n\nAir purifiers that have CADR values above these ranges are shown in independent 3rd party test reports as >800 or >450. For example:<\/p>\n\n\n\n<\/figure>\n\n\n\nCouldn\u2019t You Just Test the Purifier in a Bigger Room to Measure a Higher CADR?<\/strong><\/p>\n\n\n\n
This is certainly possible, and may give a perceived \u2018higher\u2019 CADR value. However, by doing this, the CADR test no longer meets the testing standard specifications. That means that the CADR value produced from this test can’t be used to compare CADR against other purifiers.<\/p>\n\n\n\n
Does that Mean that Companies Marketing Air Purifiers With CADR Values over 800m^{3<\/sup>\/hr or 450cfm are Lying?<\/strong><\/p>\n\n\n\n}
If a company modifies the standard testing method to measure higher CADR values, then they could test and publish any CADR value they like. But this would mean that the CADR value they give cannot be used to compare against other purifiers.<\/p>\n\n\n\nFor example, when Smart Air tested the\u00a0Smart Air Blast Air Purifier<\/a>\u00a0in our lab, we found a CADR value of 890m^{3<\/sup>\/hr. However, we make clear that this value was tested by Smart Air in house.<\/p>\n\n\n\n}
Using Real World Tests as a Way to Validate High-CADR purifiers<\/h5>\n\n\n\nFor cases where purifiers are required for large spaces over 100sqm, we recommend performing real world tests to ensure maximum cleaning efficiency.<\/p>\n\n\n\nFor example, Smart Air\u2019s\u00a0Blast<\/a>\u00a0and\u00a0Blast Mini<\/a>\u00a0air purifiers are powerful purifiers designed for large spaces. Smart Air can provide after-sales services including real world testing to make sure you are receiving the best clean air possible with your purchase.<\/p>\n\n\n\n
Are There Any Other Measurements I Can Use When Purchasing an Air Purifier?<\/strong><\/p>\n\n\n\n
Other than CADR, an air purifier\u2019s air flow rating and air changes per hour can also be used to estimate a purifier\u2019s effectiveness in your room.<\/p>\n\n\n\n
Learn more about air changes per hour and how to calculate it here \u00bb<\/a><\/p>\n\n\n\n
Learn more about the differences between air purifier airflow and CADR here \u00bb<\/a><\/p>\n\n\n\n
<\/p>\n
Was this article useful?<\/span><\/i>3<\/count><\/span><\/i>1<\/count><\/span><\/span><\/div><\/div>","protected":false},"excerpt":{"rendered":"Knowledge Base Protecting Yourself Air Purifiers Why Can\u2019t CADR Values over 800m3\/hr or 450cfm Be Measured Reliably? The CADR test is an\u00a0industry standard number\u00a0to compare the performance of air purifiers. There are\u00a0two common standards\u00a0for measuring CADR, they are\u00a0the AHAM AC-1 standard in the US, or the GB … Read more<\/a><\/p>\n","protected":false},"author":7807,"featured_media":0,"menu_order":0,"comment_status":"closed","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":[673,857,613],"helpie_tag":[1269,145,113,1335,178],"helpie_add_tag":[],"helpie_up_tag":[],"class_list":["post-5573","pauple_helpie","type-pauple_helpie","status-publish","format-standard","hentry","helpdesk_category-air-purifiers","helpdesk_category-general-questions-smart-air-purifiers","helpdesk_category-protecting-yourself","helpie_tag-aham","helpie_tag-cadr","helpie_tag-room-size","helpie_tag-standards","helpie_tag-test"],"_links":{"self":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/5573","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=5573"}],"version-history":[{"count":7,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/5573\/revisions"}],"predecessor-version":[{"id":5587,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/pauple_helpie\/5573\/revisions\/5587"}],"wp:attachment":[{"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/media?parent=5573"}],"wp:term":[{"taxonomy":"helpdesk_category","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpdesk_category?post=5573"},{"taxonomy":"helpie_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_tag?post=5573"},{"taxonomy":"helpie_add_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_add_tag?post=5573"},{"taxonomy":"helpie_up_tag","embeddable":true,"href":"https:\/\/smartairfilters.com\/learn\/wp-json\/wp\/v2\/helpie_up_tag?post=5573"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}}