This 4-Inch Round Duct Fan Adopts Pure Copper Coil, Which Has Higher Power And Longer Service Time; Double Ball Bearing, Nsk Bearing, Strong Power; Cold Rolled Stator Steel Plate Has Good Magnetic Conductivity And Faster Running Speed. The Guide Air Ring Is Combined With Aerodynamics, So That The Exhaust Is Stronger, The Speed Is Faster, The High-Speed Operation Is Not Deformed, And The Air Flow Is Smooth; Ip2X Waterproof Grade Ensures That The Machine Maintains Good Performance In Humid Environment; Split Design, Easy To Install And Clean. Specifications:Voltage:110V/60HzColor:BlackMaterial :Moisture And Oil Resistant Pp MaterialPower: 40WCurrent: 0.18ASpeed: 2600r/MinWind Pressure:200paCaliber: 3.77”Air Volume:310m³/h Noise : 30dbWaterproof: Ip2XProduct Size:Approx. 11.33*3.78*6.89”Packing Size: 12.2*5.12*8.27"Net Weight: 3.96 IBPackage Weight: 4.62 IBLarge Air Volume, Pure Copper Motor, Double Ball Bearing, Diagonal Flow Pressurization, Moisture And Oil Resistant Pp MaterialApplicable Space: Kitchen, Bathroom, Hot Pot Shop, Barbecue Shop Packing List:1x 4-Inch Round Duct Fan 1x Instruction4x Screws