Motor Kit for Contractor Series Bath Fans: Replacement FAQ
By We re still here！ | Published: 2026-11-01
Category: Product Reviews
Answers to common questions about replacing a bathroom exhaust fan motor with the Motor Kit for Contractor Series Bath Fans, including fit, symptoms, and installation.
Quick answer
If your contractor series bath fan motor has failed, the Motor Kit for Contractor Series Bath Fans is the direct replacement. It includes the motor plate, plug-in motor, and impeller, and it fits several NX-series models.
Why a kit instead of just a motor
A bare motor often leaves you reusing a worn impeller or struggling with a mounting plate that does not match. This kit bundles the motor plate, permanently lubricated plug-in motor, and impeller with hardware, so you replace the parts that wear together and avoid a second teardown later.
When replacement is the right call
Replace the motor when the fan runs but moves little air, makes grinding or rattling noises, or stops entirely despite power at the switch. If the fan is simply dirty, cleaning the grille and impeller may restore performance without a new motor.
Fit limits to check before ordering
This kit is for use only with the brand's ceiling/wall exhaust bathroom fans and is compatible with models NX503, NX503B, NX504, NX504B, NX703, and others in that series. The CFM option lets you choose a 60 CFM upgrade using the NX70K motor kit. If your fan is not a contractor series model, this kit is not the right match.
Replacement FAQ
- How do I know if my bath fan motor is bad?
- Common signs include the fan running without moving air, loud grinding or rattling, or no response when you turn on the switch. Confirm power reaches the fan before blaming the motor.
- Will this motor kit fit my fan?
- It fits contractor series ceiling/wall exhaust bathroom fans, including models NX503, NX503B, NX504, NX504B, NX703, and others. Look for your model number on the fan housing or motor plate. If your model is not listed, measure the motor plate and compare before ordering.
- Can I upgrade to 60 CFM with this kit?
- Yes, choose the NX70K motor kit option when you order. The kit is interchangeable with contractor series fans, so the higher-CFM motor fits the same housing.
- What is included in the kit?
- The kit includes the motor plate, a permanently lubricated plug-in motor, the impeller, and the hardware needed for installation.
- How hard is the replacement?
- Plan for a basic DIY job: turn off power at the breaker, remove the fan grille and old motor assembly, then install the new plate and plug-in motor. The plug-in design avoids rewiring the motor itself. If you are not comfortable working at the ceiling with electrical components, hire a qualified electrician.
Product facts
- Motor Kit for Contractor Series Bath Fans: Includes motor plate, permanently lubricated plug-in motor, impeller, and hardware. You get the wear parts in one box, so you do not need to source a separate impeller or plate.
Motor Kit for Contractor Series Bath Fans - Motor Kit for Contractor Series Bath Fans: Interchangeable with contractor series bath fans and compatible with models NX503, NX503B, NX504, NX504B, NX703, and others. Check your model number against this list before ordering to confirm a direct fit.
- Motor Kit for Contractor Series Bath Fans: A 60 CFM upgrade is possible with the NX70K motor kit option. If your current fan is undersized for the room, you can increase airflow while replacing the motor.
