The Holmes HAP726-U Allergen Remover for Medium Rooms This Holmes Allergen Remover is up to 99.97% efficient in removing allergens such as pollen, dust, mold, pet dander and smoke from the air passing through the filter. It also helps fight common household odors with the power of Arm and Hammer Baking Soda. Features four speed settings, programmable auto off timer and filter life monitor. Recommended for rooms up to 256 sq ft, and with replacement filters HAPF600DPDQ-U HEPA and HAPF60PDQ-U Carbon. Features & Benefits Quiet Operation Designed to be quiet with a low-vibration motor, advanced fan blade and specially designed True HEPA filter material to allow the air purifier to run continuously without disruption. Dual Position Can be placed vertically or horizontally – you decide how it fits best in your room. Multiple Setting Timer Timer allows you to automatically run your air purifier for up to 16 hours. Electronic Filter Monitors Alert you when odor and True HEPA filter changes are needed to maintain maximum performance. Hanging Filters Easy to access hanging filters make replacement quick and easy. How It Works Enhanced Filter – The carbon odor filter, which has been treated with baking soda, is designed to trap larger particles as well as absorb and eliminate odors that may come from pets, garbage, bathrooms, litter boxes, smoke and cooking. True HEPA Filter – removes up to 99.97% of airborne allergens as small as 0.3 microns from air passing through the filter. These allergens include ragweed pollen, grass pollen, tree pollen, household dust, dust mite debris, mold spores, pet dander and smoke. Clean, Filtered Air is distributed into the world with a fan to improve air circulation. The slim design oes not intrude into your room like conventional air purifiers and can be positioned against the wall.