The 4-72 series centrifugal fan has the advantages of high efficiency, low noise, stable pressure curve and wide application range. It can be used for ventilation and air supply. The following gases can be transported: air,unnatural gases and other gases that are harmless to human beings and non-corrosive to steel materials. No viscosity substance is allowed in the gas. Dust and hard fine particles in the gas should be no more than 150 mg/m3, and the temperature must be lower than 80℃. The fan can be made into two forms as shown in the picture. The air outlet has a variety of angles and the adjustment range is 0-255°. The interval of No.2.8A is 45° and the interval of No.3.2-6A is 22.5°.