FC-3 въздушен вход странична стена вход за домашни птици ферма пиле къща, китай FC-3 въздушен вход странична стена вход за домашни птици ферма пиле къща производители, доставчици, фабрика-шандонг yuyun sanhe машини co., ltd

Air door is opened under gravity and controlled by a draw rope, no need spring. It is also filled with an insulation board inside.
The draw rope is designed on the top of air inlet. Pull the rope to close the air door, and release the rope to pen the air door.
The air inlet back can be equipped with anti-bird net or light-trap as per request which is fixed by bolts & nuts.
The angle of air guide plate can be adjusted as per customer speed.