#1 brand recommended by allergists * Helps capture certain airborne germs * Circulates room air up to 5 times per hour & AHAM CADR Rated 300 - Room Size: 21" x 22" (465 sq. ft.) * Activated Carbon Prefilter helps reduce unpleasant odors * Easy tap electronic controls w/ 3 air cleaning levels plus Turbo Clean setting & 2, 4, & 8 hour timer. Electronic filter replacement reminders. * Easy tap electronic controls w/3 air cleaning levels plus Turbo Clean setting & 2, 4, & 8 hour timer. Electronic filter replacement reminders