The Replacement HEPA Air Purifier H Filter is certified to help capture up to 99.97% of the following microscopic airborne allergens and particles as small as 0.3 microns: dust pollen pet dander dust mite debris and smoke*. These Honeywell HEPA Filters are designed exclusively to fit Honeywell HEPA Air Purifier models HPA050/150 HPA 060/160 and HHT055/155 Series. For best performance use only Genuine Honeywell air purifier filters and replace each filter every 12 months. *From the air that passes through the filter 0.3 microns and larger.