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Can I Change The Wiring For My New Exhaust Fan And Light Fixture?

How to Wire a Bath Exhaust Fan and Light Fixture: You could junction in the exhaust fan junction box or a new junction box could be installed in an accessible location and separate out the switched wiring, one which will lead to the bathroom exhaust fan and the other that will lead to the recessed light fixture.

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Bath Exhaust Fan and Light Fixture
[ad#block]Electrical Questions I am replacing an old bathroom ventilation fan/light combo unit with a new fan (without a light kit)and a new recessed ceiling light fixture.

Thank you

Background: Trish, a Handy Woman from North Hampton, NH.

Dave’s Reply:
Thanks for your electrical question Trish.

How to Wire a Bath Exhaust Fan and Light Fixture

Skill Level: Beginner to Intermediate.
Tools Required: Basic Electricians Pouch Hand Tools, a non-aluminum ladder and Voltage Tester.
Estimated Time: Depends on personal level experience, ability to work with tools and access to the light fixture and exhaust fan.
Precaution: Identify the bathroom light circuit, turn it OFF and  Tag it with a Note before working with the wiring.
Notice: Installing additional bathroom fixture electrical wiring should be done with a permit and be inspected.

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FAQs Frequently Asked Questions and Comments

2 Responses to “Can I Change The Wiring For My New Exhaust Fan And Light Fixture?”
  1. Kevin M says:


    Ive heard that some of the contractor special exhaust fans have a very small junction box. I am trying to tie an already existing exhaust fan to a new recessed shower light on the same switch, but I don’t want to cut into the wall because its textured and I don’t have access to the ceiling. Should I still be OK tying into the exhaust fan from the recessed light?
    If I need a bigger junction box, what would be recommended?

  2. Dave Rongey says:

    Hi Kevin,
    Yes, most of the exhaust fan junction boxes are small and there is usually just enough room for the connections of the incoming cable wires, and that’s about all there is room for. So if this is the case with your existing exhaust fan then consider removing the cable from the exhaust fan and installing a junction box in the attic space where the original cable for the exhaust fan may be spliced with two new cables, one for the exhaust fan and one for the recessed light fixture.