A bathroom exhaust fan, if you do not have it, might be a surprisingly useful tool for you. Not only does the small box-shaped fan removes the loathsome smells from the bathroom, but also makes the bathroom more hygienic and moisture free.  If you do have an exhaust fan and you come out with your bathroom all foggy after each shower, it means your exhaust fan isn’t doing its job. If you’ve stumbled upon here, you might be facing this problem already, or your bathroom exhaust fan might be making weird vibrating noises or simply not turning on anymore. The Solution? Go out buy a new one and change yours with a few simple steps.

How to Replace Bathroom Exhaust Fan
P.C: Youtube

Step 1: Buying a new Bathroom Exhaust Fan

When choosing your new exhaust fan, you might be confused with the huge choice you get in the markets. The key is to keep an eye out on only three things: CFMs, sones and the size obviously.

It saves a lot of hassle and makes replacement easier if you choose a new fan of the same size. You could just open the old one and carry it with you to the store to find the right fit.

Now for CFM, this is cubic feet per minute of air that flows through the fan. This is important because the larger the room, the higher you want the CFM to be. A standard medium sized bathroom would require one with about 70 to 90 CFM.

Sones is how much sound the fan makes. It could typically range from 0.5 to 4. It’s best to choose one rated 1 or 2 sones, since it’s considered quiet enough not to bother you and not too quiet that forget to turn it off when you leave.

Considering these few things and your budget, you could never go wrong with choosing the right exhaust fan.

Step 2: Removing the old exhaust fan

CAUTION: The first thing to do is switch off the circuit breaker! Make sure no one turns it’s on throughout the replacement.

Start by opening any screws on the exhaust fan cover, and once it hasbeen removed, you can simple open it up. Now before you touch any of the electrical connections, use a tester mains tester screwdriver or a voltage tester to check if there is any current still flowing through the wires. Once it has been doublechecked that the power is off, label the wires, so you do not forget which is which.You can proceed by disconnecting the wires from the exhaust fan. Take out any screws that mount the exhaust fan to the wall. Now the whole fan can be carefully pulled out.

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Step 3: Fitting the new exhaust fan

The area might require some cleaning before anything further is done, but right after that,you can begin fitting your new exhaust fan.

If your new fan is a different size, a few adjustments to the wall may be needed.

For larger ones, hold the new fan up to the wall where you’ll be inserting it and mark it.

CAUTION: Be sure to wear masks and safety glasses as there will be a lot of dust. Use an angle grinder to cut the wall along the markings.Remember not to push too hard. Afterwards, clean up.

For smaller ones, depending on the difference in size you may need to rebrick the space or simply just use joint compounds to fill in the extra space. Sand it smooth after letting the joint compound dry.

In all cases, apply primer and paint to polish up.

Now, holding the new exhaust fan in place mark in points where drilling needs to be done for the mounting screws. Drill holes into the required points. Slide in the exhaust fan into the hole and secure with screws. Replace the live, neutral and switched wires accordingly and wrap with insulation tape if required. Adjust any fan settings as desired (optional). You can now replace the lid and tighten the screws. Switch on the circuit breakers and test if the exhaust fan is operating perfectly. Use caulk to clog in any gaps around the exhaust fan. Finish off by applying paint.

You have now successfully replaced your old bathroom exhaust fan with a new operational one.

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Mohiuddin Shawon

Mohiuddin Shawon is the Chief Editor and Content Researcher of topcoolingfan.com. He is also the chief editor of The Blazing Home . Mohiuddin Shawon is a professional Electrical Engineer. He is the main pillar of Top Cooling Fan. His engineering skill and research help us to find the top quality fan for the general public.