How to Install a Bathroom Fan

Written by: Milan Rosan
DIY Specialist
(800) 375-3403

A bathroom ventilation fan exhausts excess moisture out of the bathroom, keeping the space dry and fungus-free. Installing a bathroom fan may be easier than you think, and is definitely a DIY project you can handle.

NOTE: Bath fans can vary across manufacturers and models, so this meant as a basic installation guide. Be sure to follow the installation instructions provided by the manufacturer.

Tools / Materials:

Bath fan, pencil, safety glasses, wood screws and drywall screws, philips screwdriver, wire cutters, wire caps, electrical tape and keyhole saw


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Step by Step Instructions

How to Install a Bath Fan: Step 1

Step 1:

Since you’re working with electricity, cut the power to the room at the junction box.

How to Install a Bath Fan: Step 2

Step 2:

Remove the old bath fan and take off the grate. Depending on the old bathroom fan, you may need to head up into the attic to finish removal. Disconnect any ductwork from the old fan before removing the unit completely.

How to Install a Bath Fan: Step 3

Step 3:

Cut a hole for new bath fan. Some newer bath fans come with a template, but if yours doesn’t, trace out a hole for new bath fan. Use a keying saw to cut.

How to Install a Bath Fan: Step 4

Step 4:

Secure the new bath fan. Depending on the model you have, you may need to install the housing first, then secure it to the ceiling using drywall screws or standard screws if you’re drilling into a joist.

How to Install a Bath Fan: Step 5

Step 5:

Finish ductwork and electrical. Back up in the attic, seal up any loose ductwork with duct tape. Connect the wiring (white to white, black to black, and green to green). Attach wire caps.

How to Install a Bath Fan: Step 6

Step 6:

Install fan cover.

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