This Honeywell Smoke Odor Air Purifier Filter is formulated with treated activated carbon to help reduce and adsorb smoke odors from cigarettes, cigars, wildfire smoke, fireplaces and wood burning stoves. * Use of this filter in your Honeywell air purifier for home, along with the pre-filter and HEPA filter, may help remove smoke odors up to 4.5x faster. ** Replace odor reducing specialty filters 4x per year. This Honeywell Smoke Odor Filter is designed exclusively to fit Honeywell Air Purifier models HPA075 and HPA175 in the Allergen Plus line and HPA080 and HPA180Series 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: **Smoke Odor reduction based on internal testing report#J2021020502. Results based on testing of the reduction of acetic acid after 1 hour of use vs natural decay using no air purifier.