This is a 36" fiberglass replacement propeller for older single-speed, direct drive evaporative coolers. If your fan is losing airflow or the old blade is cracked or chipped, this part restores the fan to its original spec.
The 6403-6112 propeller is built from fiberglass, chosen for its resistance to wear from continuous operation and its light weight relative to strength. It's a direct fit for older single-speed direct drive fan assemblies where the original blade has cracked, warped, or lost balance over time. Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
Critical Fitment & Requirements
- Diameter: 36" — matches original equipment sizing for older single-speed direct drive units.
- Blade count: 3-blade configuration.
- Material: Fiberglass construction.
- Fits: Older style single-speed, direct drive 36" PolarCool evaporative cooler models only.
- Does NOT fit: Variable speed fans equipped with touchpads or speed dials.
An out-of-balance propeller is the most common source of a new-part complaint on direct drive coolers — a blade that isn't centered and torqued evenly on the motor shaft will set up a wobble that loosens the mounting hardware over time and can eventually stress the motor bearing. Before final tightening, hand-spin the propeller through several rotations to check for wobble or shaft misalignment, and use a torque wrench to seat the hub hardware to the motor manufacturer's spec rather than tightening by feel. This keeps vibration transfer to the housing and mounting frame to a minimum, which matters for both bearing life and for avoiding the loosening of fasteners that can lead to a dropped or damaged blade. Confirm the shaft key or set-screw engagement matches OEM fitment before restoring power.
Key Benefits
- Fiberglass blade construction resists cracking and wear from continuous cooling-season use.
- Three-blade design matches original airflow performance for single-speed direct drive units.
- Genuine PolarCool replacement component sized to original equipment specifications.
- Straightforward shaft-mount installation suited to DIY replacement.
| Spec | Value | Unit |
|---|---|---|
| Diameter | 36 | in |
| Blade Count | 3 | blades |
| Material | Fiberglass | - |
| Type | Replacement Propeller | - |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Fits: Older style 36" single-speed, direct drive PolarCool evaporative cooler fans.
- Does NOT fit: Variable speed fans with touchpads or speed dials.
| Item | Detail |
|---|---|
| Material Safety | Fiberglass construction — handle with standard precautions for fiberglass materials (gloves recommended during installation) |
| Installation Requirement | Disconnect power to the cooler before servicing the propeller |
FAQ
What size is this propeller?
This propeller has a 36" diameter with a three-blade configuration, built from fiberglass.
Will this fit my variable speed cooler with a touchpad?
No. This propeller is designed for older style single-speed, direct drive 36" models only. It is not compatible with variable speed fans that use touchpads or speed dials.
Can I install this myself?
Yes. Disconnect power to the cooler, remove the old propeller from the motor shaft, align and secure the new propeller, then restore power and test operation. No professional installation is required for most DIYers.
Is this a genuine PolarCool part?
Yes. Part No. 6403-6112 is a genuine PolarCool replacement propeller made specifically for single-speed, direct drive 36" cooler fans.
Warranty & Registration
Manufacturer warranty terms for this part are not detailed in the available product data. [NEEDS VERIFICATION] Please refer to the "Resources (System Manuals and Warranty)" Tab above on this page for manufacturer warranty documentation, or contact us before you order if you need confirmation — we always reply back.
