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Wiring for a Bathroom Exhaust Fan

By Dave Rongey - Summary:

The Basics of Installing Electrical Wiring for a Bathroom Exhaust Fan: Answers to all of your questions about installing a bath exhaust fan and your bathroom exhaust fan replacement project.

Wiring a Bathroom Exhaust Fan

Electrical Question: I am wiring a bath exhaust fan that also has a light.


This electrical question came from: Brian, a Homeowner from Goshen, KY.

Additional Comments: Great site. Very informative and easy to read. I am definitely adding it to my favorites. Thanks for the info.

Dave’s Reply:
Thanks for your electrical wiring question Brian.

Wiring for a Bathroom Exhaust Fan

Application: Wiring Switches for a Bathroom Exhaust Fan and Light.
Skill Level: Intermediate to Advanced – Best installed by a Licensed Electrician.
Tools Required: Electricians Tools, Pouch of Hand Tools and a Voltage Tester.
Estimated Time: Depends on personal level experience, ability to work with tools and the access to the wiring for the wall switch for the exhaust fan and if a larger switch box will be required.
Precaution: The combo bathroom exhaust fan circuit should be identified, turned OFF and Tagged with a Note before working with the wiring and installing the fan speed switch.
Notice: Modifying existing wiring or installing additional bathroom electrical wiring and an bath exhaust fan should be done according to local and national electrical codes with a permit and be inspected.

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2 Responses to “Wiring for a Bathroom Exhaust Fan”
  1. Dave Rongey says:

    Hi Max,
    The electrical load of the fan would depend on the size of the fan as there are so many different types of fans and exhaust fans. This article is about bathroom exhaust fans which are relatively small, the motors is fractional HP, and require a low amount of power so they would not significantly affect the load of a generator.
    Hope this helps.

  2. Max "Generator" Stanford says:

    What kind of power do fans usually draw? It doesn’t seem like it would be that much. I was thinking about someone living in a rural area where the electrical system can be a bit touchy. If there was a natural problem or failure how much could a generator pick up comfortably? Would it be worth it to disconnect non-essentials like a fan?