Upgrade 8664RP 8663RP Bathroom Fan Motor Replacement - Quiet 100CFM

In this review the Cylrod Upgrade 8664RP 8663RP motor assembly is evaluated as a straightforward replacement for Nutone and compatible bathroom exhaust fans. The bottom line: this motor is for homeowners and installers who need a direct-fit, quieter replacement that restores airflow without rewiring or extensive modification. It stands out because the motor uses a pure copper winding and is rated at 100 CFM, delivering solid airflow while operating at a lower noise level than many older OEM units.

Key Features

• Wide compatibility: Fits a long list of Nutone B unit models and many common replacements, reducing the hassle of confirming fit for older vents.
• Quiet operation: Rated at 3.5 sones so it removes moisture and odors with noticeably less noise compared with older, louder motors.
• Upgrade motor construction: Pure copper windings improve electrical conductivity and heat dissipation versus older aluminum-wound motors.
• Complete kit: Ships with the replacement motor, grounding clip, fan wheel and motor isolation block for a full, ready-to-install swap.
• Simple installation: The motor can be swapped in about 10 minutes for anyone comfortable with basic electrical safety and screwdrivers.
• Tested and supported: The unit is factory tested and comes with a three-year service promise for repair or replacement on qualifying defects.

Who It's For

This motor is best for homeowners, plumbers, electricians, and DIYers who have an older Nutone or similar bathroom exhaust fan that has lost performance or become noisy. Because it is a direct-fit replacement for many B unit models, it is especially useful where matching the exact part number is difficult due to discontinued OEM motors.

It is not ideal for someone seeking a high-end ultra-quiet or variable-speed retrofit; if you need a fan that is quieter than 3.5 sones, or integrated smart controls, a modern replacement fixture or a dedicated low-sones model would be a better choice.

Pros & Cons

Pros

• Easy to install and fits many Nutone model numbers, making replacement quick.
• Quieter than many older OEM motors, providing usable airflow at a lower noise level.
• Packed as a full assembly with wheel, isolation block and grounding clip for convenience.
• Pure copper construction improves durability and heat handling over older designs.

Cons

• Rated at 3.5 sones, it is quieter than very old units but not as silent as premium low-sones fans.
• Compatibility is broad but installers should still verify physical fit for unusual housings.

Specifications

Airflow	100 CFM
Noise level	3.5 sones
Speed	1460 RPM
Electrical	120V, 0.19 A
Included parts	Motor, grounding clip, fan wheel, motor isolation block
Material	Pure copper winding
Warranty	3-year service

Our Verdict

The Cylrod Upgrade 8664RP 8663RP is a pragmatic, cost-effective replacement motor for Nutone-style bathroom fans: it restores airflow reliably, runs quieter than many aged originals, and is supplied as a complete assembly for fast installation. For anyone needing a dependable repair without replacing the whole fixture, it offers good value and long-term durability thanks to copper windings and a three-year service policy.

Frequently Asked Questions

Will this motor fit my Nutone B unit?
It fits a wide range of Nutone B unit models listed in the product details, but verify the B unit shape and mounting points to ensure a physical fit.

How quiet is this motor in normal use?
It is rated at 3.5 sones, which is noticeably quieter than many older OEM motors but not as quiet as premium low-sones fans.

What comes in the replacement kit?
The kit includes the replacement motor, grounding clip, fan wheel and motor isolation block for a straightforward swap.