[Coverage] Designed to clean spaces up to 361 sq. ft. in 12.5 minutes or up to 874 sq. ft. in 30 minutes. Timer: 1, 4, 8 hours [HyperCaptive Filtration System] Combination of a pre-filter, deodorization filter, and True HEPA Filter reduces 99.999% of 0.01-micron particles, including pollen and other allergens. It also reduces 99% of volatile organic compounds and odor. [Auto Mode] Constantly monitoring the air quality, the fan automatically adjusts to most effectively purify your space as needed providing a new level of clean in real time. [Eco Mdoe] When the air quality in the room remains purified for 30 minutes or more in Eco Mode, the fan will turn off to conserve energy, kicking on again when pollution is detected. [3-Stage Manual Fan Speed] Control your AP-1512HH's fan manually with low, medium, and high settings. [Air Quality Indicator] Pollution sensor communicates indoor air quality in real-time. Brightly colored LED lets you know how clean or dirty your indoor air is every minute of the day. You can turn off the light for sleeping. [Filter Alerts] The air filter indicator tells you when the filters need to be replaced, and the pre-filter needs to be cleaned for maximum efficiency, based on how much air they have processed. [Ultra Quiet] Ultra quiet operation with noise levels ranging from 24 dB to 53 dB. [Timer] Schedule the unit to purify 1, 4, or 8 hours of use and conserve energy.