Choosing the Right Bathroom Fan: Understanding CFM
Bathroom fans are an integral part of any bathroom—and they're even required by law. According to the National Electrical Code, a bathroom fan is required in bathrooms without a window to provide ventilation. In some places, you must have a bathroom fan even when an adequate window is present.
A bathroom fan can bring many benefits to your home or business. However, to work properly and be up to code, they must be vented to the outdoors. Bathroom exhaust fans typically run through ductwork or sidewalls.
Bathroom exhaust fans can create excellent airflow, remove odors and moist air, and enhance the aesthetic of any restroom. They're available in sleek styles and various sizes to suit your needs.
Here at HVAC Jack, we're proud to offer top-of-the-line bathroom exhaust fans. We carry some of the top brands in the industry! Furthermore, our products are built to last. We even have various sizes to suit your needs. Check out our full line of exhaust fans today!
If you're in the market for a new bathroom fan, there are several different options to choose from. It's important to do your homework to find a bathroom fan with the right size, parts, and features you care about most.
In this post, we'll discuss the various types of exhaust fans on the market. We'll also talk about the importance of CFM, how to find the right bathroom fan, how to install one, and more!
What is CFM?
CFM is short for cubic feet per minute. A fan's CFM is a numerical value for how much air can flow through the unit every 60 seconds. The higher the CFM, the more air output the fan will produce.
When looking to purchase a new bathroom exhaust fan, you'll need to consider the bathroom fan CFM. To figure out the CFM you need, think about your bathroom size and the amount of moisture in the space.
How to Determine the Right Bathroom Fan CFM
To determine bathroom fan CFM, you must understand the exact dimensions of your bathroom. To get this information, start by measuring the length, width, and height of your restroom. You will get the size of this space by multiplying these numbers together. Then, you need to convert this number to CFM. Multiply your bathroom size by 0.13 to get your minimum CFM rating. Make sure to choose an exhaust fan with this CFM amount or higher. Anything less could lead to poor airflow and other issues within this space.
Types of Bathroom Exhaust Fans
Bathroom exhaust fans come in many different shapes and sizes. You can get them mounted almost anywhere!
Here are the most popular types of bathroom exhaust fans:
Ceiling-Mounted Fans
These fans are the most popular. You can find them located on the ceiling, usually right above the toilet or in the vicinity. These fans are often less noticeable than other types. You can even install them within a light fixture!
Wall-Mounted Fans
This solution is used when a ceiling fan doesn't make sense. Wall-mounted exhaust fans usually have vents that push air directly outdoors. This means you don't have to worry about connecting new vents to existing ductwork!
Window-Mounted Fans
These fans are installed like window AC units. They move air directly outside without the use of vents or ducts. Although they're less popular than other types, they're still effective.
Inline Fans
Inline fans connect to your existing ductwork. They're installed in a remote location, such as above the bathroom ceiling or in the attic. This fan attaches to a grille in the bathroom, which connects the system.
What is the Standard Size Bathroom Fan?
Standard bathroom fans are intended for spaces 100 feet or less. Keep in mind you'll need at least 1 CFM per square foot of room space. However, you should choose a higher bathroom fan CFM than you really need. This will ensure you're covered. For example, if you calculated that you need a bathroom fan with a CFM of 54, purchase one at 60 CFM or higher.
Typical Sizing for Larger Bathrooms
If you have a larger bathroom space, such as one over 100 square feet, the CFM calculation works a little differently. For sizing your exhaust fan, consider all the fixtures in your bathroom. Then, add up the CFM ratings for all fixtures to get the total CFM you need.
Here are the CFM ratings for common bathroom fixtures:
- Bathtub: 50 CFM
- Jetted tub: 100 CFM
- Shower: 50 CFM
- Toilet: 50 CFM
As an example, if your larger space has a toilet and shower, choose a CFM rating of 100 or higher.
Noise Ratings
When looking for a great fan, you should also consider how much sound the unit will emit. A quieter fan might be best for relaxation, while a louder fan may be more suitable for drowning out sound.
Bathroom exhaust fans categorize sound by their sone number. A sone rating of "1" will create the least amount of noise, while a sone rating of 5 is the loudest. This is equivalent to the sound of moderate rainfall.
How to Install a Bathroom Exhaust Fan
When it comes to installing a bathroom exhaust fan, make sure you choose a professional. Improper installation could lead to airflow issues, damage to your home, and even electrical problems.
Here are some tips for a safe and effective install process:
- Place the vent on the ceiling or high up on the wall to catch rising air before it spreads through the space.
- Attach the fan to a duct or vent that goes outside the home.
- Install the system using hard ducts to reduce condensation and noise.
- Ensure ducts are as straight as possible.
- Seal all connections and joints with aluminum tape.
- Prevent pests by installing a roof cap or wall vent at the duct exhaust point.
If you want to improve your home with a top-notch exhaust fan, contact us today to get started! HVAC Jack has the best exhaust fans in the business.