Rheem-Ruud 70-21858-12 Fan Blade

Successful field repairs on residential condensers require exact matches for rotational dynamics. The Rheem-Ruud 70-21858-12 Fan Blade is a precision-engineered condenser fan blade replacement designed to restore critical airflow in Protech and Rheem outdoor units. Featuring an 18-inch diameter and a specific 27-degree pitch, this 2-blade aluminum propeller is optimized for CCW rotation (counter-clockwise) to pull heat away from the condenser coils efficiently. The 1/2-inch bore hub is located on the intake side for a secure fit on standard motor shafts, ensuring balanced operation and reduced vibration. For technicians servicing old systems, this direct-fit HVAC fan blade provides the necessary static pressure and CFM ratings required by the original manufacturer. Whether you are addressing a bent blade or a rusted hub, verifying the 70-21858-12K cross-reference ensures your service call is completed to factory standards without compromising motor integrity or system head pressure.

Key Benefits for Technicians:

• OEM Precision: Specifically designed for Rheem and Ruud condensing units to maintain factory airflow specifications.
• Corrosion Resistance: High-quality aluminum construction prevents rust build-up in harsh outdoor environments.
• Vibration Reduction: Factory-balanced 2-blade design protects the motor bearings from premature wear.
• Standard Compatibility: The 1/2-inch bore and intake-side hub location allow for rapid installation on most standard condenser motors.

Common Questions:

What is the correct rotation for the 70-21858-12?
This blade is designed for counter-clockwise (CCW) rotation as viewed from the discharge side (opposite the motor). Installing a blade with incorrect rotation will lead to system overheating and high-pressure cutouts.

Can I use this on a 5/8-inch motor shaft?
No, this blade is engineered exclusively for a 1/2-inch shaft. Attempting to modify the bore will throw off the balance and cause catastrophic motor failure.

Does this include the hub set screw?
Yes, the fixed hub includes the necessary set screw for securing the blade to the motor 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.