VEVOR 20 inch Shutter Exhaust Fan, Wall Mounted Attic Vent Fan with Smart Programming Variable Speed Temperature Control, 4800 CFM,EC Motor,Timer, for Shed,Garage,Greenhouse Ventilation Cooling,Black Electrostatic Coating Spiral Fan Blades Weather-Resistant Build Robust Housing Flexible Mounting Broad Compatibility Airflow: 4800 CFM,Noise Level: ≤70 dB(A),Air Speed: 6.5 m/s,Item Model Number: AMX-FAGEC20,Item Dimensions: 23.03 x 23.03 x 8.54 in / 585 x 585 x 217mm,Louver Opening Angle: ≥50-Degree,Net Weight: 16.42 lbs / 7.45 kg ,Power: 75W ,RPM: 1000 RPM,Main Material: Q235B Carbon Steel,Rated Voltage: AC 120V 60Hz