4-79-14D Centrifugal Fan

This article's table of contents introduction:

1. The Breakdown
2. Most Likely Product Specifications
3. Common Manufacturer Example
4. Where is this fan used?
5. Important Note

The part number 4-79-14D typically refers to a specific size and type configuration within a well-known series of centrifugal fans.

Here is the breakdown of what this nomenclature generally means, followed by the most common specifications for a fan with that ID.

The Breakdown

• 4: Usually refers to the Series or Pressure Class.
  • In many manufacturers (like New York Blower, Chicago Blower, or Greenheck), a "4" indicates a Class IV duty fan, designed for higher static pressures (often up to 30" w.g. or more).
• 79: Refers to the Airfoil (AF) Wheel design.
  • The "79" is a standard code for an Airfoil blade. These blades are hollow (airfoil shaped, like an airplane wing) and are the most efficient type of centrifugal wheel for clean air. They are quiet and used for high-volume, high-pressure HVAC and industrial applications.
• 14: This usually denotes the wheel diameter in inches.
  • In this case, a 14-inch diameter wheel.
• D: Refers to the Arrangement (Drive Configuration).
  • "D" almost always refers to Arrangement 10 (sometimes Arrangement 5 or other variants depending on the specific manufacturer's catalog). The most common interpretation is Arrangement 10:
    • Arrangement 10 (AR-10): The fan wheel is overhung on a shaft supported by two bearings outside the fan housing, connected to a motor via a belt drive. This is the most common industrial arrangement for belt-driven fans.

Most Likely Product Specifications

Based on the industry standard "4-79-14D" model, here are the typical physical dimensions and operating specs:

• Wheel Diameter: 14 inches (Nominal)
• Wheel Type: Airfoil (AF), backward-inclined, high efficiency.
• Inlet Size: Usually 9" or 10" (depending on manufacturer's specific inlet cone).
• Discharge Size: Approximately 10" x 8" or 10" x 10".
• Max RPM: Typically around 3,000–4,000 RPM (depends on wheel weight and class).
• Max Static Pressure: Can range from 8" w.g. to 20"+ w.g. depending on speed and motor HP.
• Max CFM: Roughly 3,000 to 5,000 CFM at higher speeds.
• Bearing Type: Typically pillow block (mounted on a separate base plate).
• Drive: Belt drive (motor mounted to same base or independent base).

Common Manufacturer Example

If you search specifically for a Greenheck or Twin City / New York Blower model:

• Greenheck QEI-14-D (similar spec) or BSI-14-D
• New York Blower 4-79-14D (exact match)

Where is this fan used?

Due to its high-efficiency Airfoil wheel and Class IV construction, this fan is used in:

• Clean Air HVAC: Large commercial buildings, hospitals, clean rooms.
• Industrial Process: Oven exhaust (clean), paint spray booths (explosion-proof motor required), dust collection (if air is clean).
• Air Handling Units: Often used as a plenum fan or in a built-up unit.

Important Note

The exact specifications (dimensions, bore, RPM, CFM, SP) can vary slightly between manufacturers (e.g., Greenheck vs. New York Blower vs. Chicago Blower). To order a replacement wheel, shaft, bearings, or housing, you must verify the specific manufacturer and serial number of your existing fan, as the "D" bore size and bolt pattern differences are common.

If you need to find a replacement wheel:

• Search: 14" Airfoil Wheel, Arrangement 10, Class 4
• You will need to know the bore size (e.g., 1-3/16", 1-7/16") and the keyway size.