This Honeywell HHT270 Air Purifier includes a Genuine Honeywell Dual Action Carbon Filter that helps capture the following microscopic airborne particles: dust, pollen, pet dander, dust mite debris and smoke.¹ Recommended for small 100 sq ft. rooms. This Honeywell Air Purifier can filter and circulate air up to 4.8 times an hour.² If you have pets or stale indoor air, air purifiers can help deliver cleaner, fresher air. This Honeywell Air Purifier earned the ENERGY STAR label by meeting strict energy efficient guidelines set by the U.S. EPA. 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.¹ Other compatible filter replacements are not guaranteed to offer the same performance or efficiency. Disclaimers: ¹From the air that passes through the filter, 2 microns and larger. Overall particle reduction depends on many factors including the amount of air processed, the particle type and the introduction rate into the environment. ² Based on 3rd party independent CADR testing for the smoke CADR value, when operated at the highest level. Air changes per hour calculations are based on the smoke CADR value x 60 minutes divided by the listed room volume (LxWxH) assuming an 8 foot ceiling. Air circulation depends on many factors, such as room size and configuration. There is no guarantee that all of the air in a room will pass through the filter.