... C, relative humidity no high than 100%. GF4-72 type FRP centrifugal fan is in a high efficiency, high performance and ... general-purpose anticorrosive fan. 1) This machine is produced by FRP composites, its appearance is more in line with the gas ... protection equipment, contains corrosive gas places, etc. GF4-72 type FRP explosion-proof centrifugal fan is according to the application conditions ...