G/Y4-73
Boiler Centrifugal Fan
G/Y4-73 is selected according to the fan position in the boiler air path. G4-73 works on the clean-air side to supply combustion air, while Y4-73 works on the flue-gas side to support induced draft after combustion.
The series is suitable for 2–670 t/h steam boiler systems. Configuration should be confirmed according to airflow, pressure, medium temperature, dust condition, corrosion risk and the site duct layout.
Carbon steel, 304 stainless steel and 316L stainless steel directions can be discussed according to temperature and corrosion requirements.
Flue gas ≤250°C
Read the Boiler Air Path Before Choosing the Fan
In a boiler room, the first selection step is to confirm where the fan works in the air path. A fan installed before combustion usually handles clean air. A fan installed after combustion must handle temperature, dust, flue-gas resistance and possible corrosion.
G4-73 and Y4-73 should therefore not be treated as the same working condition. Even when airflow and pressure appear similar, the medium condition may require different material, motor, bearing, casing and maintenance arrangements.
Four Checks Before Model Confirmation
Confirm whether the fan works before combustion-air entry or after flue gas leaves the boiler.
Clean air, hot smoke, dust concentration and corrosive components change the configuration direction.
Include boiler resistance, duct loss, dust-collector resistance, dampers and chimney conditions.
Carbon steel, 304 stainless steel or 316L stainless steel should follow the actual duty.
Clean-Air Side and Flue-Gas Side Comparison
| Selection Point | G4-73 Clean-Air Side | Y4-73 Flue-Gas Side | What to Confirm |
|---|---|---|---|
| Medium | Clean air | Smoke / flue gas | Dust, temperature and corrosive components |
| Temperature | ≤80°C | ≤250°C | Whether a high-temperature configuration is required |
| System Load | Air-supply resistance | Boiler, collector and flue resistance | Actual pressure loss across the complete system |
| Material | Usually simpler to configure | May require corrosion-resistant material | Carbon steel / 304 / 316L direction |
Main Fan Structure and Site Data
Single-inlet centrifugal models cover the main range from No.8D to No.28D.
Elastic coupling transmission supports stable operation in large boiler systems.
Left-hand or right-hand rotation and the outlet angle should match the site duct direction.
Impeller, casing, inlet, regulating device and transmission parts form the main fan unit.
G4-73 Clean-Air Side Performance Data
The following G4-73 data is for preliminary clean-air-side review. Final configuration should be checked against boiler capacity, required airflow, total pressure and motor standard.
| Model | Speed r/min | No. | Airflow m³/h | Total Pressure Pa | Motor Model | Power kW |
|---|---|---|---|---|---|---|
| G4-73 No.8D | 1450 | 1 | 16156–30993 | 2104–1400 | Y180M-4 | 18.5 |
| G4-73 No.9D | 1450 | 1 | 23003–32079 | 2668–2559 | Y200L-4 | 30 |
| G4-73 No.9D | 1450 | 2 | 35052–44128 | 2440–1775 | Y225S-4 | 37 |
| G4-73 No.10D | 1450 | 1 | 31554–60533 | 3301–2194 | Y250M-4 | 55 |
| G4-73 No.11D | 1450 | 1 | 41999–47427 | 4003–3986 | Y280S-4 | 75 |
Y4-73 Flue-Gas Side Performance Data
The following Y4-73 data is for preliminary flue-gas-side review. Before quotation, confirm smoke temperature, collector resistance, dust condition and corrosion risk.
| Model | Speed r/min | No. | Airflow m³/h | Total Pressure Pa | Motor Model | Power kW |
|---|---|---|---|---|---|---|
| Y4-73 No.8D | 1450 | 1 | 16156–18244 | 1303–1298 | Y160M-4 | 11 |
| Y4-73 No.8D | 1450 | 2 | 20442–30993 | 1284–868 | Y160L-4 | 15 |
| Y4-73 No.9D | 1450 | 1 | 23003–32079 | 1651–1584 | Y180L-4 | 22 |
| Y4-73 No.9D | 1450 | 2 | 35052–44128 | 1511–1100 | Y200L-4 | 30 |
| Y4-73 No.10D | 1450 | 1 | 31554–44004 | 2041–1959 | Y225S-4 | 37 |
Information Needed Before Quotation
Confirm clean-air side or flue-gas side before choosing G4-73 or Y4-73.
Include boiler, duct, dust collector, damper and chimney resistance.
Temperature affects material, motor arrangement and bearing configuration.
Confirm carbon steel, 304 stainless steel or 316L stainless steel direction.
Continue from G/Y4-73 to Product Family, System and Related Models
Use the aggregation and system pages to confirm the correct clean-air or flue-gas direction. Specific product pages remain available for direct model comparison.
Compare G4-73 with other combustion-air and clean-air boiler fan directions.
View Boiler FD Fans →Compare Y4-73 with other flue-gas extraction and negative-pressure directions.
View Boiler ID Fans →Review the complete combustion-air route, resistance sources and control requirements.
View FD System →Review the flue-gas route, collector resistance, furnace pressure and chimney discharge.
View ID System →Compare another boiler forced/induced draft series for steam boiler and fluidized-bed duty.
View GY5-51 →Review a boiler blower and induced-draft direction for small and medium industrial boilers.
View GY6-41 →Get a G/Y4-73 Boiler Fan Quote
Send the fan position, airflow, pressure, temperature, medium, dust condition, material requirement, outlet direction, voltage and quantity.
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