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Everything You Need to Know about a Bathroom Exhaust Fan

Everything You Need to Know about a Bathroom Exhaust Fan. The exhaust fan is a crucial component in any home bathroom. When left unmaintained, it could spell bad news for homeowners. And yet, it is still one of the most overlooked repairs during bathroom renovations.

But what is the importance of the exhaust fan and how can you tell if it needs repairs?

In this short guide, we’ll show you everything you need to know about your bathroom exhaust fan.

Prevent Common Exhaust Mistakes

If you are an owner of a bathroom, you have probably heard the importance of an exhaust fan. But many don’t make sure that it is functioning correctly. One of the first things you should make sure of is that you are using it correctly.

Exhaust mistakes you should avoid:

  • Using the fan while the bathroom door is open.
  • Turning the fan off while you bathe.
  • Turning the fan on after you step out of the shower.
  • Using the fan as an air vent.
  • Leaving the bathroom door open while you use the fan.

All of these things may seem minor to you, but it could mean that your bathroom exhaust fans are not working properly.

A bathroom exhaust fan is an essential component of any bathroom, as it helps to remove moisture, odors, and pollutants from the air. Here’s everything you need to know about a bathroom exhaust fan:

  1. Why do you need a bathroom exhaust fan? Bathrooms are prone to high humidity and moisture, which can lead to mold, mildew, and unpleasant odors. An exhaust fan helps to remove this excess moisture and keep the bathroom dry, reducing the risk of damage and improving indoor air quality.
  2. How does a bathroom exhaust fan work? A bathroom exhaust fan is typically installed in the ceiling or on the wall, and it works by drawing in air from the bathroom and venting it outside. As the air is expelled, it takes moisture, odors, and pollutants with it, leaving the bathroom fresher and drier.
  3. What are the types of bathroom exhaust fans? There are several types of bathroom exhaust fans available, including ceiling-mounted, wall-mounted, inline, and combination fans with lights or heaters. Some models also come with features such as timers, motion sensors, and humidity sensors.
  4. What should you consider when buying a bathroom exhaust fan? When buying a bathroom exhaust fan, you should consider factors such as the size of your bathroom, the noise level of the fan, its airflow capacity, and energy efficiency. Look for models that are quiet, powerful, and have a high CFM (cubic feet per minute) rating.
  5. How do you install a bathroom exhaust fan? Installing a bathroom exhaust fan typically involves cutting a hole in the ceiling or wall, wiring the fan to a switch or timer, and venting it outside. It’s important to follow the manufacturer’s instructions and local building codes, or hire a professional to install the fan for you.
  6. How do you maintain a bathroom exhaust fan? To keep your bathroom exhaust fan working properly, you should clean the grille and fan blades regularly, replace the filter if applicable, and check the vent duct for any obstructions or damage. It’s also a good idea to test the fan periodically to ensure it’s working properly.

Overall, a bathroom exhaust fan is an essential component of any bathroom, as it helps to remove moisture, odors, and pollutants from the air, promoting a healthier and more comfortable living environment.

The Toilet Paper Test

One of the best ways to tell if your bathroom fan is working is by observing how the toilet paper is affected by the airflow. You need to make sure that the toilet paper does not touch the floor.

This is how it works:

Blow air continuously for about two minutes via the bathroom fan. Lift the toilet paper and watch how it is affected. If the toilet paper is held in place and does not touch the floor, then the fan is working properly. This is a sign that the fan is very powerful. However, if the toilet paper lowers, then there is a problem with the fan.

You should note that the toilet paper needs to be placed at a specific height (six inches above the floor) to ensure proper ventilation. If the toilet paper lowers too much, then there is something wrong.

Why the Exhaust Fan Is Important

With your bathroom exhaust fan in place, you can prevent mildew and mould from forming.

Mould and mildew are harmful to your health, especially if they are left untreated. Small amounts of these substances can cause allergies in some people. If left untreated, they can cause respiratory problems and even death.

Exhaust fans are crucial in bathrooms to keep mildew and mould growths at bay. This is especially true if you live in a humid climate, if you shower a lot, or if your home has poor ventilation.

Exhaust fans also expel the water vapour in the bathroom, helping to prevent mildew and mould growths.

It should be noted that your bathroom does not have to be especially humid for the fan to remove moisture from the air. Rather, it is the showering and any water that flows from the toilet that makes the fan important.

Finding the Right Exhaust Fan

There are several things you have to consider when choosing bathroom exhaust fans. First, determine what type of fan you need. A bathroom exhaust needs to be effective.

Installing an exhaust fan that is not powerful enough can lead to air leaks in your ventilation system. It will not be able to properly expel the air in your bathroom. Exhaust fans are also important in preventing mould and mildew growth.

Advancements in technology have made it possible for exhaust fans to be quieter than before. Still, you might want to install a fan that is within the range of the noise level of a library.

You have to consider the size of the bathroom when choosing the right bathroom exhaust fan. You should opt for a powerful fan that covers as much space as possible. That way, you get to enjoy the best ventilation capabilities.


Choosing the right bathroom exhaust fan is vital in maintaining proper ventilation. We hope that the tips mentioned above can help you determine what’s right for your needs.

Make sure your bathroom exhaust fan is working and well-maintained. At Can Do Duct Cleaning, we provide air duct cleaning services in Toronto, including inspection and repairs for your exhaust fan. Contact us today for more information.