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Choosing an air cleaner: CADR, filters and ozone

Match particle-cleaning capacity to room size and avoid ozone-generating devices.

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A guide for choosing a portable air cleaner by room. Have the room area, product manual, CADR data and filter maintenance costs. Price varies. Air cleaners do not replace source control or ventilation; no brand is endorsed.

Your try-it-at-home checklist

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Compare a particle CADR sufficient for the room area; a bigger room generally needs a higher rate.
Distinguish particle filters such as HEPA from activated-carbon filters for certain gases and odors; CADR rates particles, not gas removal.
Avoid devices designed to emit ozone, and review possible ozone emissions from ionizing or similar technology.
Follow placement and filter-replacement instructions; continue ventilation and source control.

Your try-it-at-home checklist

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