Motoasis Upgrade 678-G/2678F-A Fan Motor Replacement - Quiet 50 CFM

Our review of the Motoasis Upgrade 678-G/2678F-A fan motor finds it best for homeowners and DIYers who need a fast, economical repair for a compatible Broan or Nutone bathroom fan. The single biggest reason to buy is practicality: this 50 CFM motor restores airflow and reduces noise without replacing the entire fixture. Installation is straightforward, the motor is a quieter 2.0 sone unit, and Motoasis backs the part with a three-year manufacturer defect replacement policy, so the product feels like a confident repair option rather than a stopgap.

Key Features

• Compatibility: Fits Broan models such as 678-G/2678F-A and Nutone 763 series, so it replaces worn motors without new grilles or housings.
• Improved motor: The upgraded pure copper motor offers greater durability and longer life than older aluminum plated designs, which reduces the chance of repeat replacements.
• Quiet operation: Rated at 2.0 sones and 50 CFM, it lowers noise while providing adequate ventilation for small bathrooms.
• Tool-free replacement: Designed for simple swap-in installation that typically takes about 10 minutes, saving time and installation costs.
• Cost savings: Replacing just the motor restores function for a fraction of the cost of a whole new fan assembly.
• Three-year coverage: Manufacturer defect replacement service for three years gives added confidence in the part's reliability.

Who It's For

This motor is aimed at homeowners, landlords, and handy DIYers who have a Broan or Nutone bathroom fan with the same 8-1/4' x 8' blade footprint and want a quick, affordable repair. It works especially well when the original motor has failed but the housing, grille and ducting are still in good condition.

People who should look elsewhere include those who require higher airflow for large bathrooms or wet rooms, or buyers whose fan housings use a different blade size or mounting configuration; in those cases a full replacement fan or a model with higher CFM would be more appropriate.

Pros & Cons

Pros

• Easy installation that most users complete in about 10 minutes without special tools.
• Noticeably quieter operation at 2.0 sones compared with older failing motors, improving bathroom comfort.
• Durable pure copper motor construction designed for longer life and better reliability.
• Three-year manufacturer defect replacement provides solid post-purchase protection.

Cons

• Limited to 50 CFM output, so it is not suited for larger bathrooms that need stronger ventilation.
• Compatibility is specific to certain Broan and Nutone series, so riders must confirm blade and housing fit before buying.

Specifications

Our Verdict

The Motoasis Upgrade 678-G/2678F-A motor is a practical, cost-effective fix for small bathrooms with compatible Broan or Nutone housings. It delivers quiet 50 CFM ventilation, improved motor durability, and easy installation, making it a smart value for anyone restoring a working fan assembly rather than replacing the entire unit.

Frequently Asked Questions

Will this motor fit my Broan 678-G housing?
It is compatible with Broan 678-G/2678F-A and similar models that accept an 8-1/4 in x 8 in blade; confirm your housing dimensions before purchase.

How difficult is installation?
Most users report a plug-in style swap that takes about 10 minutes and does not require professional tools or advanced skills.

What warranty is included?
The manufacturer offers a three-year defect replacement service covering non-human-fault malfunctions.