... Characteristics of WUSUN Poultry ventilator:Exhaust Fan -Huge air volume, Low noise, Good energy saving, Little ... temperature is. -keep the air change 80-90 times per hour - Wall or window mounted. -Blade Pulley of Light ... on2.Commerce: hall, supermarket, hotel, net bar, recreational place, guesthouse.3.Public: hospital, station, gym, school4.Animal ... 184/303/383: big size wall mounted poultry ventilator