... outline border,anti-corrosion 4.Nylon fan blade, durable poultry and livestock ventilation fanDescription:1) Energy saving. Take 54’’ type ... cubic meters.3)lower noiseour perfect design concept and material decrease the noise,and it can work steady. 4)long lifetimeThe ... directly ,it has no belts,belt pulley ,bearing and other damageabl rotating components,and the rotation speed of our motor is just ...