Generic Replacement Air Purifier Filter For Holmes HAPF300APD-U4
97%. The filter is compatible with all aer1 ready Air Purifiers, and it is recommended to be replaced every 12 months for optimal performance.. The Holmes HAPF300APD-U4 filter is highly effective in removing various particles such as dust, smoke, pollen, odors, mold spores, and pet dander from the air, with a filtration rate of up to 99.