A set of 4 Premium quality carbon-based pre-filter designed to replace the 8171434K pre-filter. It fits air purifier models AP300, AP350, AP450 and AP510. This pre-filter captures 99.7-Percent of particles as small as 0.3 microns. It helps remove common household odors, including smoke cooking odors and pet odors. It also helps filter dust, pollen and impurities from air. Designed by NISPIRA
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