1.This product is suitable for large-scale chicken farm as effectively ventilation equipment to reduce the temperature and prevent diseases inside the chicken coop.

2.It can be directly installed in the side wall.

3.The air inlet is made of high quality engineering plastic injection process ,anti-insects and birds into the poultry.

4.There is PS insulation board which is thick as 20mm fill in the inlet to avoid lost of heating in winter.

5.Pullet adopts the patented design,it is rolling friction when open and close,small resistance,easy to switch.

6.Return spring,stainless steel springs,durable and no rust.

7.The air inlet can be operated by the operator observe a negative form manually operator to use their experience.

8.A set of air inlet can open with three angle so the ventilation is more reasonable.

9.Slightly open the inlet near exhaust fan ,completely open the ones away from the exhuast fan to achieve uniform air.

Protection net connection change from button type to bolts& nuts type,which effectively avoid the damage in transportation.

Added with special designed pull rod pulley which reduce friction and facilitate installation mostly by holding up pull rood or steel rope.

Air door is opened under gravity,and closed under cord control.No need spring.

Made of excellent quality engineering plastic by injection molding,higher density and more firmly.