[. . . ] Impurities are drawn into the unit, and are routed through a special filtering system. [. . . ] The unit runs so quietly, we added an LED indicator to let you know it's operating. 50% QUIETER 1 All CarriAir models offer these features: · Over 50% quieter than · "Pure-check"TM LED other leading brands1 indicator tells you when to replace filter · Three blower speeds · Power cord housing CarriAir HEPA Technology Air Cleaner models: · 99. 97% Filter media · Captures smoke, dust, lint, · Carbon-activated pre-filter efficiency2 pollen, mold spores and helps extend the life of bacteria in the HEPA your HEPA material filter2 media filter system CarriAir Smoke & Odor Air Cleaner models: · 97% Filter media efficiency3 · Captures smoke, odors, dust, lint, pollen, mold · Filter contains 240 grams spores and bacteria in the of carbon-activated HEPA media and carbonparticles4 activated filter system · Carbon-activated pre-filter helps extend the life of your system filter Model CFM CADR 100 200 135 220 Recommended maximum sq. ft. 150 320 192 340 HEPA Type 30BQ050-070IOM 100 31CSA2201D 200 Specially Designed for Smokers 31CSB1201D 125 31CSB2201D 210 1year Limited Warranty Before we clean the air, let us clear up the terminology. CADR (Clean Air Delivery Rate) ­ The amount of clean air, measured in cubic feet per minute, that an air cleaner delivers to a room. 2 ­ The filtration material used in this appliance has been independent laboratory tested to certify that it meets the stringent High Efficiency Particulate Air filter (HEPA) standards and will eliminate 99. 97% of all contaminants larger than 0. 3 microns that pass through the filter. The stated efficiency of the filtering material is not indicative of the actual performance of the actual assembled filter. 3 ­ The filtration material used in this appliance has been independent laboratory tested and will eliminate 97% of all contaminants larger than 0. 3 microns that pass through the filter. [. . . ] The stated efficiency of the filtering material is not indicative of the actual performance of the actual assembled filter. [. . . ]