Heavy Duty Centrifugal Fan Double Inlet Centrifugal Blower 3 Phase

This article's table of contents introduction:

1. What is a Double Inlet Centrifugal Blower?
2. Common Applications
3. Typical Construction & Features (Heavy Duty)
4. Key Performance Specifications You Need
5. Example Selection Table (General Reference)
6. Important Considerations
7. What is your specific goal?

It sounds like you are looking for information or specifications on a Heavy Duty Centrifugal Fan, specifically a Double Inlet Centrifugal Blower that runs on 3-Phase power.

These are commonly known as Double Inlet, Double Width (DIDW) fans. They are industrial workhorses designed for high-volume airflow against moderate to high static pressure.

Here is a breakdown of what this typically means, common applications, and selection criteria.

What is a Double Inlet Centrifugal Blower?

• Double Inlet (DI): Air enters the fan wheel from both sides of the housing. This allows the fan to move significantly more air (CFM) than a single-inlet fan of the same wheel diameter.
• Double Width (DW): The impeller (wheel) is wider than a standard single-width fan. This further increases airflow capacity.
• 3 Phase: The motor requires a 3-phase AC power supply (e.g., 208V, 230V, 460V, 575V). This is standard for heavy-duty industrial machinery because it provides higher torque, better efficiency, and longer motor life than single-phase power.

Common Applications

These fans are used where large volumes of air must be moved reliably, often 24/7.

• HVAC Systems: Large commercial rooftop units, central station air handlers (blow-through or draw-through).
• Industrial Ventilation: Factories, warehouses, paint booths, and fume exhaust systems.
• Dust Collection: For handling dusty air (often with an abrasion-resistant coating).
• Drying Systems: Textile drying, paper mills, and agricultural dryers.
• Clean Rooms: Providing constant, high-volume filtered air.

Typical Construction & Features (Heavy Duty)

• Housing: Heavy gauge steel or fiberglass-reinforced plastic (FRP) for corrosive environments. Often designed for a Class I, II, or III construction (higher numbers = thicker metal for higher pressures).
• Impeller: Typically backward-inclined or airfoil blades (for high efficiency) or radial blades (for handling dirty/sticky material).
• Motor: TEFC (Totally Enclosed Fan Cooled) or ODP (Open Drip Proof). Mounted on a rigid base with an adjustable belt drive (most common) or direct drive.
• Bearings: Heavy-duty ball or roller bearings, often with grease lines for remote maintenance.
• Shaft: Large diameter, ground and polished, keyed to the impeller.

Key Performance Specifications You Need

To select or operate this fan, you must know or provide these three core values:

1. Airflow (CFM - Cubic Feet per Minute): How much air you need to move.
2. Static Pressure (SP - Inches of Water Gauge [in. w.g.]): The resistance the fan must overcome (from ducts, filters, dampers, etc.).
3. Air Density (Temperature & Altitude): Standard air is 70°F at sea level. Higher temperatures or altitudes require a motor with higher horsepower.

Example Selection Table (General Reference)

Note: These are approximate values. Actual performance varies by manufacturer. You must use the manufacturer's fan curve.

Important Considerations

• Drive Type: Belt-drive is most common for heavy-duty DIDW fans. It allows you to change the fan speed (RPM) to adjust CFM by changing the pulley. Direct-drive is simpler but requires a Variable Frequency Drive (VFD) to change speed.
• Material of Construction: Standard is Carbon Steel. Stainless Steel (304/316) is needed for corrosive or hygienic applications. Aluminum is used for spark-resistant applications.
• Inlet/Outlet Configuration: Fan arrangement (e.g., Arrangement 3, Arrangement 1) determines how the motor is mounted. Rotation (CW or CCW) and discharge position (e.g., Horizontal, Downblast, Upblast) must match your ductwork.
• Wiring: A 3-phase motor requires 3 power wires (plus ground). It will not run on standard 120V/240V household power unless you use a phase converter.

What is your specific goal?

To give you a more accurate answer, please clarify:

• Are you buying one? Provide the required CFM and Static Pressure.
• Are you troubleshooting one? Describe the problem (e.g., won't start, low airflow, excessive vibration, overheating motor).
• Are you wiring one? Confirm the voltage (e.g., 230V, 460V) and the motor nameplate Full Load Amps (FLA).
• Are you looking for a part? Look for the manufacturer name and model number on the housing nameplate.

If you are in the market for one, search for: "DIDW centrifugal fan [desired CFM] [desired SP] 3 phase" using a reputable manufacturer like New York Blower, Chicago Blower, Greenheck, Twin City Fan, or Aerovent.