This article's table of contents introduction:
- Product Core Specifications
- Design & Construction Features
- Customization Options (The "Customizable" Aspect)
- Performance Comparison: 50Hz vs. 60Hz
- Application Examples
- Selection Checklist for Supplier
- Typical Dimensions (Approximate)
- Final Recommendation
Here is a detailed breakdown of a Customizable 5.5 kW Centrifugal Flow Fan designed for 50Hz/60Hz operation. This type of fan is typically a Backward Curved (BC) or Airfoil centrifugal fan, known for high efficiency, stable performance, and non-overloading power characteristics.
Product Core Specifications
| Parameter | Specification | Notes |
|---|---|---|
| Power | 5 kW (7.5 HP) | Motor rating |
| Frequency | 50 Hz / 60 Hz | Dual-frequency capable (windings designed for ~480V/60Hz or ~400V/50Hz) |
| Voltage | 380V / 460V / 415V (Customizable) | Delta or Star-Delta starting |
| Phase | 3-Phase | Standard IP55 motor |
| Speed (Typical) | 1450 RPM (50Hz) / 1750 RPM (60Hz) | 4-pole motor. Direct drive or belt drive. |
| Max Flow (Approx) | 8,000 – 15,000 m³/h (4,700 – 8,800 CFM) | Depends on impeller size and system resistance. |
| Max Pressure (Approx) | 1,500 – 3,000 Pa (6 – 12 inWG) | Total pressure (Static + Velocity). |
Design & Construction Features
- Impeller Type: Backward Curved (BC) or Airfoil blades. These are non-overloading (motor will not burn out even if duct is blocked).
- Housing: Heavy-gauge steel (2-3mm), welded with stiffeners. Options for stainless steel (304/316) for corrosive environments.
- Drive Configuration:
- Direct Drive (Option A): Motor shaft directly coupled to impeller. More compact, lower maintenance. Best for constant speed.
- Belt Drive (Option B): Motor outside airstream (bulkier). Best for variable volume control via pulley change. Allows speed changes without changing motor.
- Bearings: Heavy-duty, regreasable, pillow block bearings (SKF/FAG equivalent).
- Duty Cycle: Continuous (S1).
Customization Options (The "Customizable" Aspect)
This is the key selling point. Standard 5.5kW fans are rigid; custom ones fit your exact ductwork.
[ ] Flow & Pressure Tuning
- Option A: High Flow / Low Pressure (e.g., 15,000 m³/h @ 800 Pa)
- Option B: High Pressure / Low Flow (e.g., 4,000 m³/h @ 3,000 Pa)
- Mechanism: Change impeller width (wheel width) or blade angle. Belt drive pulleys adjust speed.
[ ] Inlet / Outlet Orientation
- INLET: Single inlet or dual inlet (for higher flow).
- OUTLET:
- Clockwise or Counter-Clockwise rotation (from drive side).
- Discharge angle: 0° (upblast), 45°, 90° (top horizontal), 180° (downblast).
- Customizable: Rectangular or round outlet.
[ ] Materials & Coatings
- Standard: Mild Steel (MS) + Epoxy/Polyester Powder Coat (RAL color).
- Custom:
- SS304 / SS316: For food, pharmaceutical, or salty air.
- PVC/FRP Lining: For corrosive chemical fumes.
- High-Temp: For 150°C – 300°C (with heat slinger and high-temp grease).
[ ] Motor Customization
- Voltage: 220V/380V/415V/460V/690V (3-phase). 1-phase not possible for 5.5kW (too large).
- Mounting: Foot-mounted (B3) or Flange-mounted (B5).
- Protection: IP55 standard. IP56/IP65 for washdown.
- Efficiency: IE2, IE3 (Standard), IE4 (Premium).
[ ] Accessories
- Inlet Cone: Bellmouth with wire mesh guard.
- Damper / Louvers: Manual or motorized (actuator) for volume control.
- Vibration Isolators: Spring or rubber mounts.
- Drain Plug: At bottom of housing for condensation.
Performance Comparison: 50Hz vs. 60Hz
If the motor is designed for dual-voltage (e.g., 380V/50Hz and 460V/60Hz) :
| Parameter | 50 Hz (380V) | 60 Hz (460V) | Ratio Change |
|---|---|---|---|
| Motor Speed | 1,450 RPM | 1,750 RPM | +20% |
| Air Flow (Q) | 10,000 m³/h | 12,000 m³/h | +20% (Proportional to speed) |
| Pressure (P) | 2,000 Pa | 2,880 Pa | +44% (Proportional to speed²) |
| Power (kW) | 5 kW | ~9.5 kW | +73% (Proportional to speed³) |
⚠️ Critical Warning: You cannot run a 50Hz motor at 60Hz without changing voltage. Doing so will cause the V/Hz ratio to drop, reducing torque and overheating the motor. The motor must be specified or rewound for dual-frequency.
Application Examples
| Industry | Application | Customization Needed |
|---|---|---|
| HVAC | Commercial kitchen exhaust / Factory ventilation | High-temp housing, washdown drains, SS316. |
| Dust Collection | Woodworking / Metal grinding | Material handling wheel (thicker), wear plates. |
| Chemical / Pharma | Fume extraction of acids/solvents | PVC coating or SS316, PTFE shaft seal. |
| Agriculture | Grain drying / Poultry house ventilation | Galvanized / CO2 resistant, belt drive. |
| Mining / Cement | Ventilation of tunnels / silos | Heavy-duty bearings, abrasion-resistant liner. |
Selection Checklist for Supplier
When ordering, provide these 7 pieces of data to get a proper custom quote:
- Required Air Flow (m³/h or CFM)
- Required Total Pressure (Pa or inWG)
- Air Density / Temperature (°C) - Hot air needs more power.
- Gas Type - Clean, dusty, corrosive, explosive?
- Power Supply - Voltage, Phase, Frequency (50/60Hz).
- Mounting & Orientation - Horizontal or vertical shaft? Clockwise or CCW?
- Noise Limit (dB(A)) - Important if for occupied spaces.
Typical Dimensions (Approximate)
Note: These vary by manufacturer, but a standard 5.5kW BC fan is roughly:
| Dimension | Approx Size |
|---|---|
| Overall Length | 800 – 1,100 mm |
| Overall Width | 700 – 900 mm |
| Overall Height | 800 – 1,000 mm |
| Inlet Diameter | 250 – 350 mm |
| Outlet Dimensions | 300 x 300 mm (square) |
| Impeller Diameter | 500 – 630 mm |
| Weight (approx) | 80 – 130 kg (without motor) |
Final Recommendation
For a Customizable 5.5kW Centrifugal Fan with 50/60Hz Frequency:
- Specify a "Dual-Frequency" motor (e.g., 380-420V Δ / 660-690V Y @50Hz ; 440-480V Δ / 760-800V Y @60Hz) OR use a VFD (Variable Frequency Drive) to run a 50Hz motor at 60Hz (but derate torque).
- Choose Backward Curved (BC) impeller for general HVAC efficiency.
- Use Belt Drive if you need flexibility to change speed/flow in the future.
- Provide your exact Q (flow) and P (pressure) so the manufacturer can select the correct wheel size.
A standard stock 5.5kW fan will work, but a customized one ensures you don't overspend on a high-power motor for a low-pressure system, or undersize it for a high-pressure duct network.
