Poultry Exhaust Fan,air Volume 17700 per hour ,Power Rating is 0.55KW,the DB less than 65,50HZ,weight 45K,Blade Dia is 710 mm Poultry Exhaust Fan-Huge air volume, Low noise, Good energy saving, Little fault -reduce the indoor temperature to less than 30, no matter how high the original temperature is. -keep the air change 80-90 times per hour - Wall or window mounted. -Blade Pulley of Light ...