The most popular sort of filters for air purifiers is the HEPA filter. The Department of Energy has rigid requirements manufacturers must pass to meet HEPA requirements. Products that say "HEPA-type" or "HEPA-like" may not meet these requirements. HEPA requirements necessitate being able to filter out 99.97% (the percentage may vary within 2 decimals) of pollutants in the air of down to 0.3 micrometres in size.

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