1.Ventilation fan frame:made of high quality galvanized steel in order to guarantee the highest strength and strong resistance to the corrosion. 2.Blade:six pcs stainless steel baldes and the fan has all passed the experiment of homeostasis with big air volume,without deformation,no breaking,attractive and durable. 3.Belt pulley:the V type belt pulley is aluminium magnesium alloy injection moulded,ligth weigh,high-strength. 4.Bearing:world-famous brand bearing,high intensity,low noise,long service life. 5.Motor:aluminium and iron shell is optional. Model Specification Blade diameter mm Blade speed rpm Motor speed rpm Air flow M3/H Pressure Pa Noise Decibels Import Power W Rated voltage V High mm Width mm ThickmmWF-820 750 960 9601500060≤70750380820820400WF-900 760 600 140020000 70≤70550380900900400WF-1000 900 600 14002900070≤7075038010001000400WF-1100 1000 600 14003500070≤7075038011001100400WF-1220 1100 439 14004000060≤70110038012001200400WF-1380 1250 439 14004400060≤70110038013801380400WF-1530 1400 439 14005500055≤70150038015381538400