Armstrong Furnace R37373B001 Fan Blade

As a veteran tech, you know that finding the exact spec for a condenser fan replacement is the difference between a smooth service call and a vibration-induced callback. The Armstrong Furnace R37373B001 Fan Blade is a genuine OEM replacement part engineered for Lennox, Armstrong, and Ducane condensing units. This 20-inch HVAC condenser fan blade features a 25-degree pitch and a 4-blade configuration designed to maintain static pressure and peak airflow efficiency in high-demand cooling cycles.

When swapping this out, verify your motor shaft diameter is 1/2 inch to ensure a secure fit on the hub. The clockwise (CW) rotation is critical; installing a counter-flow blade will lead to motor overheating and poor heat transfer across the coil. This heavy-duty aluminum fan blade is balanced to minimize bearing wear on your 1/2" bore condenser motors, providing the structural integrity needed for long-term outdoor exposure. Stick with the R37373B001 Armstrong Air spec to ensure the CFM delivery matches the original system design parameters.

Key Benefits for Contractors

• Precision Balanced: Reduces harmonic vibration to protect the motor bearings and extend the life of the assembly.
• Exact OEM Fit: Eliminates the guesswork of universal "adjustable" blades that often fail to match the original 25-degree pitch.
• Durable Construction: High-grade aluminum blades resist corrosion and maintaining aerodynamic profile under high-torque starts.
• Direct Compatibility: Drop-in replacement for common Lennox 37373B001 and Ducane fan blade applications.

Common Questions

How do I confirm the rotation of this blade?
The R37373B001 is rated for Clockwise (CW) rotation. To confirm, look at the discharge side (the side air is moving toward) to ensure the rotation matches your motor's lead orientation.

Will this fit a 5/8" motor shaft?
No, this specific model is designed with a 1/2 inch bore. If you are upgrading the motor to a larger shaft size, you will need a matching hub or a different blade assembly.

Does this include the set screw?
Most OEM assemblies include the integration hub with a set screw already tapped, but we recommend retaining the hardware from the previous hub just in case or using a high-grade replacement to prevent slipping on the shaft flat.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.