... 383Characteristics of WUSUN Poultry Ventilation Equipment:Exhaust Fan -Huge air volume, Low noise, Good energy saving, Little ... how high the original temperature is. -keep the air change 80-90 times per hour - Wall or ... factory temperature in less than 30 and make air change 80--90times per hour,no matter how ... rabbit, cow barn5.Agriculture: horticulture, greenhouse. big size box steel air blower fan