![\"\"](\"http:\/\/smartairfilters.com\/cn\/wp-content\/uploads\/sites\/3\/2016\/06\/3-17-300x226.png\")
<\/figure><\/div>\n\n\n\nHow often should I change the HEPA filter?<\/h2>\n\n\n\n
We recommend replacing your filter after 90 days of use at 8 hours a day at the latest. That\u2019s maximum 720 hours in total. We ship replacement HEPAs<\/a> starting at Rs.1300 from our store.<\/p>\n\n\n\n Why 90 days? Smart Air co-founder Gus tested a single HEPA on his Original DIY for 200 days to see how long it would last in real Beijing air. After 100 days of use at 8 hours a day in Beijing, effectiveness dropped 4%. After 200 days of testing, Gus\u2019s dirty filter was only removing half the particles in the room. This test was done in Beijing. Indian air and Delhi’s in particular is about twice as bad as Beijing’s<\/a> so filters won’t last as long in these higher pollution levels.<\/p>\n\n\n\n We know that buying new HEPA filters is a significant recurring cost, so we do our best to keep prices low.<\/p>\n\n\n\n Find out more and see the data on our tests on our HEPA longevity test<\/a> blog post.<\/p>\n\n\n\n HEPA filters are designed to capture particles like the small PM 2.5 particles. Activated carbon, though, captures odors and gases like volatile organic compounds (VOCs). VOC is a big category and includes harmful carcinogens like formaldehyde and benzene.<\/p>\n\n\n\n To answer this question, we ran tests with an Industrial Scientific MX6 iBrid gas detector that can detect VOCs and a host of harmful gases. In an enclosed 4.14m2 porch, we lit three cigarettes (known to emit formaldehyde and benzene), turned on a Cannon fan with a carbon filter, and tracked VOC concentration. We also ran a control test of a fan with no carbon attached. The results (left) showed the carbon layer effectively reduced VOC concentrations.<\/p>\n\n\n\n Not necessarily. Not all homes have dangerous levels of harmful gases or VOCs that would call for a carbon filter. VOCs are more common in homes:<\/p>\n\n\n\n If you have inflammation or asthma symptoms, you may also consider using a carbon filter.<\/p>\n\n\n\n Yes. Activated carbon is not very effective at filtering particulate pollution, the primary pollutant affecting cities in China. For that, a HEPA is still the best choice.<\/p>\n\n\n\n If you use a Cannon, you can install an activated carbon filter and a HEPA filter simultaneously. On the fan opening, first place the HEPA then place the carbon filter on top (as shown in the Filter Order diagram to the right).<\/p>\n\n\n\n Please note: the carbon filter shouldn\u2019t be used along with a HEPA on the Original as the air flow rate is not sufficient. It is possible to use just a Carbon filter on the Original (no HEPA filter) if you think you have a serious VOC problem.<\/p>\n\n\n\n We tested this in our labs, we tried washing, vacuuming and scrubbing a HEPA filter to find out if there was a cheaper way of making your filter last longer. Turns out none of these methods were effective in increasing the lifespan of a HEPA filter, so we still recommend replacing them when their time is up.<\/p>\n\n\n\n <\/p>\n","protected":false},"excerpt":{"rendered":" What is a HEPA filter? A HEPA filter is the core of any purifier, it’s what captures the really small particles that are dangerous to our health. The quality of the HEPA filter you use will affect the amount of clean air you’ll get. All HEPA filters have a fixed … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-9248","page","type-page","status-publish"],"_links":{"self":[{"href":"https:\/\/smartairfilters.com\/in\/en\/wp-json\/wp\/v2\/pages\/9248","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/smartairfilters.com\/in\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/smartairfilters.com\/in\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/in\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/smartairfilters.com\/in\/en\/wp-json\/wp\/v2\/comments?post=9248"}],"version-history":[{"count":15,"href":"https:\/\/smartairfilters.com\/in\/en\/wp-json\/wp\/v2\/pages\/9248\/revisions"}],"predecessor-version":[{"id":23700,"href":"https:\/\/smartairfilters.com\/in\/en\/wp-json\/wp\/v2\/pages\/9248\/revisions\/23700"}],"wp:attachment":[{"href":"https:\/\/smartairfilters.com\/in\/en\/wp-json\/wp\/v2\/media?parent=9248"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"\/wordpress\/wp-content\/uploads\/sites\/5\/2017\/10\/hepa_longevity.png\")
<\/figure><\/div>\n\n\n\nWhat is activated carbon?<\/h2>\n\n\n\n
![](\"\/wordpress\/wp-content\/uploads\/sites\/5\/2017\/10\/what_carbon-1024x379.png\")
<\/div>\n\n\n\nDoes activated carbon really work?<\/h2>\n\n\n\n
![\"\"](\"https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/5\/2017\/10\/does_carbon_work.png\")
<\/figure><\/div>\n\n\n\nDoes everyone need a carbon filter?<\/h2>\n\n\n\n
Do I still need a HEPA and a Carbon?<\/h2>\n\n\n\n
How do I install a carbon filter?<\/h2>\n\n\n\n
![\"\"](\"\/wordpress\/wp-content\/uploads\/sites\/5\/2019\/05\/Stacking-order.png\")
<\/a><\/figure><\/div>\n\n\n\nCan I wash my HEPA filter?<\/h2>\n\n\n\n
![\"\"](\"https:\/\/smartairfilters.com\/wordpress\/wp-content\/uploads\/sites\/5\/2016\/01\/washing_a_hepa.png\")
<\/figure><\/div>\n\n\n\n