... noise, big flow volume, stable operation, rot durable. The roof blower ( blower , roof fan ):Features: light, low noise, big flow volume, stable operation ... . ( We can make rot resistant style in special situations.)Usage: power plant, rubber factory, car factory, motor factory, textile factory and ... .Diameter:Ø280~2400mm,volume:1380~220000 m3/h,pressure150~1000Pa. roof blower ( blower , roof fan )