G4-73 and Y4-73 boiler ventilation and induced draft fans are applicable to ventilation and induced draft fan systems of 2-670t/h steam boilers in thermal power plants. G4-73 can also be used for mine ventilation and general ventilation without other special requirements.

The medium conveyed by the ventilator is air, and the maximum temperature shall not exceed 80 ℃; The medium conveyed by induced draft fan is flue gas, and the maximum temperature shall not exceed 250 ℃. A dedusting device with a dedusting efficiency of not less than 85% must be installed in front of the induced draft fan to minimize the dust content of the flue gas entering the fan.

Both G4-73 and Y4-73 centrifugal ventilation and induced draft fans are single suction intake fans, and the transmission mode is coupling direct drive (D type). There are 13 machine numbers, including No8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 25, 28 and 29.5.