- Measure the length and width of your bathroom. Multiply the two numbers together to determine the total square feet.
- If your bathroom is less than 100 square feet, use a fan that exhausts one cfm for every square foot of floor area. If your bathroom is sixty square feet, you need a ventilation fan that is rated for at least 60 cfm. To be on the safe side, the minimum size fan we use no matter what the size of the bathroom is 86 cfm.
- What does cfm stand for? It is short for cubic feet per minute, a measurement of the velocity at which air flows into or out of the space.
- If your bathroom is over 100 square feet, choose the size your fan according to the fixtures in the bathroom. Add 50 cfm for each toilet, shower or bathtub. If you have a jetted bathtub, add an additional 100 cfm. For example, if your bathroom has a toilet, shower and jetted tub, you need a ventilation fan rated for at least 200 cfm. (If in doubt give us a call and we can help you determine the right size for your needs.)
A properly sized fan with improper duct work reduces the overall cfm of the fan. You’ll want to make sure the duct work is sized properly and doesn’t have any kinks in tight turns.
We hope this information has given you some steps to take to fight off future mold from forming in your bathrooms. If you do have mold problems, please call a professional to assess the situation and determine what the best fix would be. Some mold problems are fairly easy to fix, while other require a lot more work and remediation.