How to Install a Bathroom Exhaust Fan

Mold and mildew in a bathroom is a common problem that can often be solved by installing a bathroom exhaust fan. By installing an exhaust fan in your bathroom, you will not only remove moist air, but also undesirable smells that are often present in the bathroom.

A small exhaust fan is often installed in the ceiling of the bathroom. If you already have a ceiling light fixture, consider installing an integrated light and fan in the space. This is often the best solution, because it does not require additional wiring.

There are many different kinds of exhaust fans with varying qualities. There are two main features to consider in choosing a fan; the amount of air the fan moves (measured in cubic feet per minute) and how loud the fan is. Consider carefully what type of fan to install, a fan that is too cheap may not move enough air, or be loud enough to be a nuisance.

You will need not only the fan, but a duct kit as well. The fan and the space should specify what type of duct work is required. You may need to make the hole for the duct work slightly larger, use a jab saw for the task. Try to get the duct work hole as close to size as possible to prevent insulation loss.

Before beginning any installation, be sure to turn off the circuit that delivers electricity to the bathroom. Use a voltage tester to make sure that the light fixture is not live. Then remove the light fixture, leaving the wiring that attached to the fixture intact.

To install the fan, fit the box that your fan will be installed into directly over the hole you have cut to accommodate the duct work. Ideally you should screw into a joist, although hangers are also often provided if there is no joist nearby. Attach your duct hose onto the mounting box.

Now run the hose into the attic, and attach it to the nearest roof soffit. You should use the instructions that come with your installation kit to attach the hose to the vent on the soffit, as these instructions will differ depending on the kit you purchase.

Then go back into the bathroom and install the actual exhaust fan unit. The wiring for the unit should already be in place from your old bathroom light fixture. Make sure that the wiring is correctly installed before screwing the exhaust fan into the mounting box.

If you don’t have access to your attic, have a bathroom on the first floor of a two story house, or don’t know what a soffit is, consider hiring a professional to do the work. Someone with experience installing exhaust fans will take only a few hours to offer you the best options for you home and complete the installation.