This Honeywell Pet Odor Air Purifier Filter is formulated with activated carbon and zeolite to help reduce and adsorb pet odors. Use of this filter in your Honeywell air purifier for home, along with the pre-filter and HEPA filter, may help reduce pet odors up to 3.5x faster. ** Replace odor reducing specialty filters 4x per year. This Honeywell Pet Odor Filter is designed exclusively to fit Honeywell Air Purifier models HPA075 and HPA175 in the Allergen Plus line, and HPA080 and HPA180 Series in the InSight line. Always purchase Genuine Honeywell replacement air purifier filters. They are certified to help capture odors. Other compatible filter replacements are not guaranteed to offer the same performance or efficiency. Disclaimers: ** Pet Odor reduction based on internal testing report#J2021020503. Results based on testing of the reduction of ammonia after 1 hour of use vs natural decay when using no air purifier.