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6 Checks Before Choosing an Air Cleaner: Room Size, CADR and Filters

Based on US EPA guidance, compare room coverage, particle versus gas filters, upkeep and ozone risks.

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Wikimedia Commons · Photo: Home Air Quality Guides (homeairguides.com) / Wikimedia Commons, CC BY-SA 2.0; no changes. · CC BY-SA 2.0 ↗

An air cleaner does not replace ventilation or eliminating pollution sources. Filter type and clean air delivery rate (CADR) answer different questions. This is general guidance, not a brand endorsement.

Your try-it-at-home checklist

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1. Measure the actual room area and ceiling height. Size a portable unit for the room where it will operate, not the whole home.
2. Compare particle CADR or stated room coverage. EPA's example CADR table assumes an approximately 8-foot ceiling; taller rooms may require a higher rating.
3. Check for particle filtration such as HEPA. Some odors and gases may need separate gas sorbents such as activated carbon; no unit removes every pollutant.
4. Confirm replacement-filter availability, manufacturer schedules and continuing cost. A dirty, loaded filter can perform poorly.
5. Place the unit where furniture or curtains do not block air intake or outlet, following the device manual's clearance and safety directions.
6. Avoid devices that intentionally generate ozone, a lung irritant according to EPA. Continue sensible ventilation and source control alongside filtration.

US Environmental Protection AgencyGuide to Air Cleaners in the Home ↗Primary EPA guidance on appropriate room size, CADR ceiling assumptions, particle/gas differences, filter replacement, limitations and ozone risk.Wikimedia CommonsAir Purifier (Levoit LV-PUR131S) (49318618757) ↗Verified Home Air Quality Guides author, homeairguides.com credit requirement and CC BY-SA 2.0 Flickr review.Wikimedia CommonsCommons: Reusing content outside Wikimedia — technical ↗Checked direct hotlink permission separately from the file-specific attribution license.

Your try-it-at-home checklist

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