... 3.GRP outline border,anti-corrosion 4.Nylon fan blade, durable poultry and livestock ventilation fanDescription:1) Energy saving. Take ... perfect design concept and material decrease the noise,and it can work steady. 4)long lifetimeThe fan casing and motor stents were ... ,also resist corrision and air-slake. Fan blade is made of nylong and fiber material,have better sturdiness and flexibitity.5) Low ...