Motion sensing dc motor. Speed selection of 80-120 cfm (4-inch duct) or 90-140 cfm (6-inch duct), Continuous running at adjustable preset low speed (30 cfm up) upon powering on, Fan boosts up to maximum speed for an adjustable preset duration (3 to 30 min) when motion detected, Includes double hanger mounting bars. Both 4 & 6 inch duct adapter, Energy star qualified for efficient cost-saving operation. 3 year manufacturer parts warranty
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