Carrier LA21RA425 Wheel

The Carrier LA21RA425 is a high-precision OEM replacement blower wheel specifically engineered for draft inducer assemblies in high-efficiency furnaces. Designed to meet the rigorous flow requirements of Carrier, Bryant, and Payne systems, this squirrel cage blower wheel facilitates the critical extraction of combustion gases through the heat exchanger. With a 4 13/64" diameter and a 2 29/32" width, this wheel features a 1/4" bore size to ensure a perfect fit on standard inducer motor shafts. Constructed from galvanized steel, it provides the structural integrity needed to withstand high-velocity centrifugal fan operations and high-temperature flue environments. The clockwise (CW) rotation (facing the hub) and balanced blade pitch minimize mechanical vibration, reducing stress on the inducer motor bearings and preventing premature system failure. For technicians performing furnace repair, using this genuine HVAC blower wheel ensures the pressure switch closes consistently by maintaining the exact static pressure required for safe combustion cycles.

• Direct OEM Compatibility: Engineered as a drop-in replacement for part numbers LA21RA425B and P441-1148, ensuring zero-mod installation.
• Precision Balanced: Factory-balanced galvanized blades eliminate rattling and grinding noises during startup and continuous run.
• Enhanced Draft Efficiency: Optimized blade geometry maintains reliable combustion airflow, stabilizing the system’s draft and preventing short-cycling.
• Industrial Durability: Heavy-duty hub and corrosion-resistant materials withstand the corrosive nature of furnace condensate and exhaust gases.

How do I verify the rotation of the LA21RA425?
This wheel is rated for clockwise (CW) rotation when viewing the hub end. Always verify the rotation of your existing inducer motor before installation to ensure proper drafting.

What are the signs that my current inducer wheel is failing?
Common indicators include persistent scraping or vibration sounds, reduced airflow at the exhaust vent, or the furnace failing to ignite due to the pressure switch not closing.

Does this wheel include the set screw?
Yes, this OEM wheel typically includes the necessary hardware to secure the hub to the 1/4" motor shaft, though reusing the existing flat-point set screw is possible if required.

This item is not eligible for free shipping.

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.