G/Y4-73 series boiler centrifugal is suitable for 2-670T/h steam boiler in the thermal power plant. If no special requirements, G4-73 is also used for mine ventilation and general ventilation, ventilation fan is delivering air, the highest temperature does not exceed 80℃. Induced draft fan is delivering flue gas, and the highest temperature does not exceed 250℃. Dust removal device must be installed in front of the induced draft fan, according to the use of the general power plant, the dust and hard particles is ≤ 150g/m3. Design temperature of G4-73 is 20℃, design temperature of Y4-73 is 140℃.