... material 2) Large wind capacity design 3) Roll bearing engine to save power, increase wind pressure and decrease energy loss4 ... , and drive out the heat in the workshop.Ventilating fan is applicable for these areas: 1. Industrial field: textile, clothes making, ... -900B1000*1000*4000.55shutter, frame, wind set aregalvanized, blade is stainlesssteel 9FJ-1000B1100*1100*4000.759FJ-1250B1385*1385*4001.19FJ ...