They also feature activated carbon pre-filters that help reduce common household odors such as those from pets, cooking and smoke. All Honeywell air purifiers are independently tested and verified by the Association of Home Appliance Manufacturers for 5 air changes per hour in the stated room size. Honeywell Bluetooth® Smart Air Purifiers will help clean the air in a room, effectively capturing up to 99.9% (AirGenius 6 - HFD360B) or 99.97% (Doctor’s Choice True HEPA - HPA250B, HPA8350B) of particles as small as 0.3 microns from the air that passes through the filters.