Features Specifications:Sell Industrial ventilator  Industry ventilatiors features:  1)These fans are operated on centrifugal system.   2)The centrifugal system keeps the shutters fully opened to obtain the efficiency of the fan at peak all the time & make the shutters closed tightly when the fan is not working.   3)There is a mash guard at the back for safety precautions.   4):Propeller : Stainless Steel Blade Dia :36" & 50" Body : G. I. Sheet   Pulley Hub : Diecast aluminum