If you have pets or stale indoor air, air purifiers help deliver cleaner, fresher air. Always purchase Genuine Honeywell replacement air purifier filters. They are certified to help capture odors and the following microscopic allergens and particles: dust, pollen, pet dander, dust mite debris and smoke. Other compatible filter replacements are not guaranteed to offer the same performance or efficiency. Air Purifier Filter Type: HEPA; Filtration For: Airborne Allergens; Dust; Dust Mite Debris; Pet Dander; Pollen; Smoke; Air Cleaner Compatibility: HPA020 Series; HPA030 Series; HPA075 Series; HPA080 Series; HPA175 Series; HPA180 Series; Width: 1.4".