... energy saving 4)Copper motor automatic poultry equipment ,animal husbandry equipment,ventilator,poultry farming equipment,livestock equipment,greenhouse ... *1535*4001.5Hammer style9FJ-900B1000*1000*4000.55shutter, frame, wind set aregalvanized, blade is stainlesssteel 9FJ-1000B1100 ... 1535*4001.5Push/pull style9FJ-900B1000*1000*4000.55shutter, frame, wind set , fan blade aregalvanized9FJ-1000B1100*1100* ...