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The Honeywell HRF201B pre-filter can be used in a variety of Honeywell Air Purifiers. A built-in carbon pre-filter layer has been added and can be instrumental in capturing 99% of airborne particles at 2 microns from the air that passes through the filter. For the very best performance, it is recommended that the HRF201B HEPAClean Replacement Filter U be replaced every 4 months. This selection of Certified Honeywell Filters are compatible with the following units: HHT270 and HHT290.