How To Vent A Bathroom Fan Through The Wall | 9 Steps Guide

How To Vent A Bathroom Fan Through The Wall

The bathroom is the common place of a house where we have to visit at least once a day. A healthy bathroom is a sign of a healthy family. That’s why; we always try to keep our bathroom clean and germ-free.

To keep the bathroom fresh and ill-smelling odor-free, we apply many kinds of liquid and refreshing scent. Making a small window or ventilator at the top part of your bathroom wall is also a wise option.

But, due to privacy or aesthetic issue, sometimes we don’t want to place a window inside our bathroom. In that case, you can adopt a bathroom fan.

In this article, I am going to talk about how to vent a bathroom fan through the wall.

Step By Step Process To Venting A Bathroom Exhaust Fan Through The Wall

Whether you are going to set up a bathroom vent through a brick wall or wooden exterior wall, the process is super simple. Of course, appropriate tools will accelerate your working speed.

But when it comes to venting a bathroom fan with the interior wall or you want to install a bathroom exhaust fan with light and heater then it’s a bit harder & tricky task. You need to duct through the attic with a duct pipe or hose.

Let’s follow the below-given procedure to install a bathroom vent through a wall.

Things Needed:

  1. A bathroom fan or exhaust fan
  2. Exhaust duct
  3. A reciprocating saw
  4. Duct tape
  5. Marker
  6. Screwdriver and pliers
  7. Hammer
  8. Torch
  9. Measuring tape

Buying an appropriate exhaust fan

There are various types of exhaust fans available on the market place like wall mounted ceiling mounted etc. And, they have many special features too. Some fans are relatively expensive while others are cheap. I would suggest that you should buy an extremely powerful exhaust fan.

Yes, it could cost you a little higher but the long-lasting performance and fast working features of a top-quality fan will surely please you. And, make sure that the fan is medium in size. A 10-inch by 10-inch fan would be perfect for a medium-sized bathroom.

Step 01: Choose an appropriate position

Placing the bathroom fan in the most perfect place will give you lots of advantages.

First of all, you must ensure that there is no hidden water pipe or electrical line inside the wall. I mean, you should make sure that you do not hamper or damage other utility facilities while making the hole. Secondly, do not place the fan near the bathroom’s light or heater.

Also, place it far from the shower and faucets of the bathroom where water could not reach the fan. Though high-quality exhaust fans are water-resistant but keeping them away from water is a good practice.

Step 02: Measure the area precisely

After choosing the perfect place, carefully start to install a bathroom vent through a wall. At first, measure the length and width of the fan accurately. Then write these measurements on a paper.

Now, take the maker and scale to draw the exact size on the ceiling. Almost all fans are square or rectangular in size. So, a 12-inch straight roller will do the trick for a 10X10 or smaller fan. Put the marks deeply so that you could easily follow them at the time of making the hole.

Step 03: Make a perfect hole inside the bathroom

Making a hole for bath fan

This part of the installation process is very crucial and you need to be intensely careful while making a hole. You should get a battery-operated reciprocating saw to start the procedure.

Start the saw by pressing the power button and wait until the saw reaches its maximum speed.

After the reciprocating saw reaches its highest speed, slowly apply the saw on the hole mark. The saw will start doing its job. All you need to do is to guide the cutter flawlessly towards the marked line.

After the first round of cutting, just use the hammer and pliers to take out the brick or wood from the hole.

Step 04: Clean the hole thoroughly

Before inserting the fan into the hole make sure that you have properly cleaned the inside part of the hole so that you can easily see the attic through the hole.

You can use a powerful vacuum cleaner or just use a mop for this cleaning job.

Step 05: Connecting the exhaust duct

Connecting duct hose to fan

Now, go to the attic and connect a 4-inch wide and 90-degree duct elbow with vent fan carrier or fan housing.

You will find a port there to connect it. After connecting it, you should secure the connecting with duct tape (foil).

Finally, add the flexible exhaust duct with the duct elbow.

You may read: Best Exhaust Fan for Kitchen Ventilation

Step 06: Attach the fan carefully

Now, it’s time to place the fan on that hole. To do that, get the fan out of its box and unfasten its wiring. Before fixing it into the hole, connect the fan with a power outlet and check if the fan is working properly or not.

Now, place the fan on the fan housing and set it exactly in the middle of the carrier. Take out the fan of the hole and connect the cable connection securely.

After that insert the fan again and attach the given screw to secure the fan on that position firmly.

Step 07: Make a duct hole through the attic sidewall

Duct hole on side wall

Staying inside the attic, choose a position in the middle part of the sidewall. Mark that position and make a small see-through hole on that spot. Make sure that the hole is not too far from the fan.

Now, go to the outside part of your home and reach the higher part of the house’s wall where the hole was placed. Use a ladder for secure climbing. Take the reciprocating saw and make a diamond-shaped hole in that position.

This kind of hole is perfect for attaching round or square shape objects on the wall using screws.

Clean the hole properly so that the exhaust duct can easily come out.

Step 08: Attach duct hose to the fan’s shutter part or wall cap

Venting A Bathroom Fan Through The Wall

Finally, add the connector duct with the wall cap. And, attach the connector with the flexible duct and secure the ducting hose firmly with duct tape.

This cap will help to keep the duct line clean and birds can’t create a nest inside it. Take the duct line inside by pushing the cap inward with your hands. Once the cap reaches close to the wall, attach it firmly to that position using screws.

That’s it; you have successfully built the venting system.

Step 9: Fix the connections

This step is a very significant part of the bath fan installation process. You may directly connect the fan with the bathroom light. As a result, you can turn on and off both of them by switching the same switch.

Make sure that you have securely connected all the wires and fastened all the screws. If you are not feeling enough confident to do this step by yourself then do not take risks. Seek help from an expert in this regard.

Finally, place the grille of the fan and you are done.

Safety Measures Of Bathroom Fan Installation

  • Use safety gear while doing the installation process.
  • Turn off the main electric switch of the bathroom before start working
  • Use a good quality ladder to reach the place
  • Stop the water connection of the bathroom
  • Don’t do this work on a rainy or freezing cold day. Rather, choose a sunny day.


Installing a bathroom fan doesn’t have to be an issue anymore. Even if you aren’t familiar with it, with this guide, i hope you already learnt how to vent a bathroom fan through the wall.

Remember there are several brands and sizes of exhaust fans out there, so you need to choose the appropriate one for you. But whatever you have in front, these are the basic steps to follow.

You may also love to read my another post on how to vent a bathroom fan through the roof.

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