Permanent True air filter with germ reduction. Ideal for large rooms. The True filter removes 99.97% of common household particles as small as 0.3 microns from the air passing through it such as dust, pollen, tobacco smoke, and cat dander. Reduces airborne germs such as , virus, and fungus. Activated carbon pre-filter reduces unpleasant odors. The glass-fiber material helps remove airborne particles without the use of chemicals or other treatments. Circulates room air up to 5 times per hour. Also features electronic filter indicator which reminds you when to replace filters. 3 air cleaning levels plus Turbo Clean setting. Easy tap electronic controls with a 2, 4, and 8 hour timer. SurroundSeal technology helps minimize air leaks and insures that the air passes through the filter, capturing particles. AHAM certified. AHAM CADR (smoke): 300. Requires both the filter and carbon pre-filter to operate. Filters included.