The fans ( blowers , blower )is high pressure, big flow, high efficiency, low noise, easy to installation. The ... fans ( blowers , blower )Features: high pressure, big flow, high efficiency, low noise, easy to installation. It also ... of high building, big factory and underground garage.Specifications: diameter:Ø282~1574mm, volume: 444~134892 m3/h, pressure: 44~1905Pa Axial Fan