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Prolongs the life of composition roof shingles with lower summer attic temperatures. Helps protect attic insulation against mold and mildew in winter by removing moisture filled air. Thermally protected motor engineered to run cool for long life and dependable service. Galvanized steel flange for durability. Engineered mounting system virtually eliminates vibration and ensures quiet operation. Precision balanced fan blades for minimum vibration and no heat distortion. 4 fan blades for greater air movement. UL and C-UL listed. 1.9A. 14" fan blade. 1300 CFM. Will ventilate 1850 sq. ft. 600 sq. in. intake. 2 year limited warranty.