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One of tallest (nearly 24 inches) and heaviest (17.5 pounds) air purifiers tested, the Winix 5500-2 Air Purifier is ideal for small-to-medium rooms (up to 360 square feet), with a True HEPA filter ...
Every model included in the Good Housekeeping Institute's rigorously tested guide to the best air purifiers you can buy has a true HEPA filter. The air purifier's fan draws air into the filter and ...
It uses a three-stage filter to trap the nasty stuff — a pre-filter, an activated carbon filter and finally, a true HEPA filter. A built-in UV-C light provides an extra layer of sanitation.
Generally, washable true HEPA filters are expensive. A high-quality HEPA filter can trap 99.97% of dust particles that are 0.3 microns in diameter. For comparison, a human hair is about 50 to 150 microns in diameter. So, a true HEPA filter is effectively trapping particles several hundred times smaller than the width of a human hair. [33]
Two proprietary scales are used to rate sub-HEPA air filters. The Home Depot scale is known as filter performance rating (FPR), and is reduced from a 1–10 scale to only 5, 7, 9, and 10. It measures ability to capture large particles, small particles, and weight change over the lifetime of the filter.
In addition, the 2001 revision to ANSI K13.1-1973 provides exclusive colors to be used for non-P100 cartridge filters, in two categories: oil-resistant (remaining R- and P- NIOSH ratings), and non-oil resistant (all N-ratings). By definition, ANSI Z88.2-2015 considers N100, R100, P100, and HE as HEPA filters.