Reznor 41004 Fan Blade

The Reznor 41004 Fan Blade is a precision-engineered OEM replacement part designed for high-static efficiency in commercial and industrial unit heaters. Featuring a 14-inch diameter and a 31-degree pitch, this 4-blade fan is optimized for maximum CFM output while maintaining structural integrity under continuous operation. The component utilizes a 1/2 inch bore and is configured for clockwise (CW) rotation, ensuring drop-in compatibility with specified blower motor shafts. Constructed from heavy-duty materials, it is built to handle the thermal stressors found in standard heat exchanger cycles without blade deformation. For technicians servicing Reznor gas-fired unit heaters or air handlers, replacing a worn or out-of-balance blade with this genuine 41004 model is critical for preventing motor bearing failure and ensuring consistent heat throw. Whether you are performing a seasonal tune-up or a critical repair, this direct-fit HVAC component restores factory-spec airflow performance to your ventilation assembly.

Key Benefits:

• Optimized Airflow Capacity: The 31-degree blade angle is specifically pitched to move high volumes of air across heat exchanger surfaces efficiently.
• Balanced Performance: Precision-balanced 4-blade design reduces vibration, protecting the motor shaft and extending the service life of the drive assembly.
• Durable OEM Construction: Industrial-grade materials resist corrosion and withstand the high temperature environments typical of unit heater applications.
• Seamless Fitment: Standard 1/2" bore and CW rotation parameters ensure a direct match for original equipment specifications without field modification.

Common Questions:

How do I verify the rotation for this fan blade?
This part is designed for clockwise (CW) rotation. When viewing the blade from the discharge side (facing the hub), the blades are pitched to push air while rotating in a clockwise direction. Always verify your motor rotation before installation to prevent overheating issues.

What are the signs that my Reznor unit heater needs a new fan blade?
Excessive noise, rattling, or visible vibration during the heating cycle usually indicate a bent or out-of-balance blade. If you notice reduced airflow or increased motor amperage draw, inspecting the pitch and integrity of the 41004 fan blade is the first step in troubleshooting.

Will this blade fit other motor shaft sizes?
No, this blade is specifically machined for a 1/2" diameter shaft. Using a bushing or forcing the fitment on a different shaft size is not recommended as it compromises the balance and safety of the blower assembly.

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.