Dust, dirt, pollen, molds and other contaminates are often recirculated throughout your home or office. This dirty air can damage your furnishings as well as affect everyones health. As an important component of your heating and cooling system, the Honeywell Enviracaire Elite Electronic Air Cleaner removes many of the airborne particles that easily pass through typical furnace filters. This unit is designed for homes which have UP TO 3.5 tons of cooling installed or less than a 1400 cfm blower package on their furnace or air handling unit.