Williams P300500 Fan Blade

Maintaining optimal static pressure and thermal transfer in Forsaire top-vent furnaces requires high-precision air movement components. The Williams P300500 is an authentic OEM replacement fan blade engineered specifically for counterflow top-vent models, including the 3508 and 35087 series. Featuring a robust 9-inch diameter and a 5-blade configuration, this component is designed to pull heat efficiently from the combustion chamber while maintaining a whisper-quiet decibel rating. The 3/8-inch bore ensures a secure, slide-on fit for Williams furnace blower motors, eliminating rotational vibration that often leads to premature motor bearing failure. Constructed from high-strength materials resistant to thermal fatigue, this direct-fit fan blade restores factory-spec airflow to 35,000 BTU systems. For HVAC contractors, using this HVAC blower part ensures mechanical compatibility and avoids the turbulence issues common with universal aftermarket alternatives. Verify your specific furnace parts list to confirm that the P300500 is the correct specification for your localized heating application.

• Precise 3/8" Bore Diameter: Ensures a seamless mechanical connection to the motor shaft for balanced, vibration-free operation.
• Optimized 5-Blade Pitch: Specifically pitched to maximize CFM output in Williams Forsaire counterflow air paths.
• OEM Structural Integrity: Rigid blade design prevents "flexing" under high heat, maintaining consistent airflow during long heating cycles.
• Direct Replacement: Eliminates the need for shaft modifications or hub adapters, reducing labor time during furnace maintenance.

Is the P300500 compatible with Monterey series furnaces?
No, this specific part is designed for Forsaire series top-vent furnaces (such as 3508331 and 3508731). Monterey furnaces typically utilize different blower assemblies; always check your model's exploded view diagram.

Can I use this fan blade if my motor has a 1/2-inch shaft?
No, this blade is strictly bored for a 3/8-inch shaft. Attempting to bore out the hub or use an adapter is not recommended as it compromises the balance of the fan assembly.

How do I ensure the blade is installed at the correct depth?
Identify the set screw alignment or the flat spot on the motor shaft. Typically, these replacement fan blades should be positioned to center the blades within the orifice plate for maximum suction and head pressure.

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.