... than 60 degree C, relative humidity no high than 100%. GF4-72 type FRP centrifugal fan is in a high efficiency ... , laboratory, PCB, environmental protection equipment, contains corrosive gas places, etc. GF4-72 type FRP explosion-proof centrifugal fan is according to ... )Speed(r/min)Volume Flow(m3/h)Total Pressure(Pa)GF4-72-3A10.751450500-2025100-450GF4-72-3A21.529001000-3420400-1800GF4 ...