Cool Attic 30 inch Belt Drive Whole House Fan with ShutterThis is a popular choice for whole house ventilation. The Cool Attic 30 inch Belt Drive Whole House Fan with Shutter is improved with quality features to add strength, eliminate vibration, and create a more stable motor mount. Dual ball bearing technology allows for superior shaft alignment and greater stability. Single family home coverageChoose the size house fna you need. The Cool Attic 30 inch Belt Drive Whole House Fan with Shutter ensures CFM high and low ratings at 4600 and 3200 to effectively ventilate single story single family sized homes. Special Features IncludeTough steel motor struts Precision-balanced aluminum fan blade Steel venturi High/low/off wall switch included UL & C-UL listed 10-year limited warrantyDurable for years of useIf you"e looking for a durable, long-lasting option, the Cool Attic 30 inch Belt Drive Whole House Fan with Shutter is the one you need. Featuring a steel venturi, tough steel motir struts, aluminum fan blades, and a white powder coat shutter this fna will ook great and likely last beyond its 10 year warranty.Versatile installationIf you need a versatile option, the Cool Attic CX24BDM-2SPD 24 inch Belt Drive Whole House Fan wth Shutter is as versatile as they come. This fan allows for joist-in or joist-out installation, meanign you can find a special place for this fan to get the ventilation you need. 8/10 ft. venitlation requirementThis unit requires a minimum of 8-10 sq. ft. of net free exhaust vent area to perform quietly and efficiently. Dual, self-aligning ball bearing mechanisms, and precision-balanced 4-blade aluminum fan assembly, contribute to quiet, reliable performance and longevity.2 speed 1/3 HP motorThe Cool Attic 24 in. belt drive 2-speed whole house fan is designed for houses with 1,200 to 1,800 sq. ft. attics. It offers an efficient way to reduce cooling costs, while keeping your whole house more comfortable. It works by pulling fresh air in from