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1. simple design, good quality, 2.easy installation, 3.double springs ensures excellent sealing, 4.long service life - details see: https://www.machineto.com/air-ventilator-poultry-air-ventilator-plastic-round-air-ventilator-10174051

The air inlet made of high quality engineering plastic which has bigger density and become more secure

Adding ultraviolet resist resin into the raw material to extend the service life

Easy to open , net is assembled outer which can protect damage from birds

There is a PE heating board which is as thick as 20mm filling in the inlet to avoid the lost of heat in winter

Size: width:600mm height:320mm thickness:160mm

Made of excellent engineering plastic under through molding process , large density make high fastness

With add into ultraviolet resist material , it’s ageing resistance is better, service life is longer Good seal easy open and close, with bird protection net in the air inlet

The first one to use pulley gear in the inlet , reduce friction and extend the service life of digging rope