VEVOR 18 inch Shutter Exhaust Fan, Wall Mounted Attic Vent Fan with Variable Speed Controller, 2200 CFM, AC Motor, Heavy-duty Steel, Low Noise for Shed, Garage, Greenhouse Ventilation Cooling, BlackElectrostatic powder coating technology ensures a smooth and durable finish, enhancing resistance to wear and corrosion while providing a sleek and uniform appearance.Helical Fan BladesDurable and Designed to Withstand Various Weather ConditionsDurable and Sturdy ConstructionVersatile Installation OptionsWide Range of CompatibilityAirflow: 2200 CFM,Noise Level: ≤68 dB(A),Air Speed: 6.8 m/s,Temperature Rise: ≤70K,Item Model Number: AMX-FAGAC18,Item Dimensions: 21.06 x 21.06 x 8.58 in / 535 x 535 x 218 mm,Louver Opening Angle: ≥50-Degree,Net Weight: 13.34 lbs / 6.05 kg,Power: 117W,RPM: 1450 RPM,Main Material: Q235B Carbon Steel,Rated Voltage: AC 120V 60Hz