It may be time to replace your vent fan; before the paint on the walls starts to peel, or there’s a buildup of mold and mildew.
You’ll need to choose a fan that is powerful enough to ventilate your bathroom.
Make sure you know what size vent fan you need and replace it before you see permanent damage.
Selecting the right size fan for your bathroom’s square footage ensures that you’ll get the right amount of ventilation in the space. Use the room size to deter-mine the necessary cubic feet per minute (CFM) rating of the fan.
A smaller, less powerful fan will generate less CFMs and are ideal for smaller bathrooms. However, bath fans that generate higher CFMs work better in larger bathrooms.
The Home Ventilating Institute (HVI)—an organization that certifies performance and efficiency of home ventilation products—recommends the below guideline for sizing a bathroom fan.
(To calculate the square footage of your bathroom you need to multiply length times width. ie. a 8 ½ foot by 10 foot bathroom would be 8.5×10 =85 square feet.)
A 50-square foot or smaller bathroom needs a 50 CFM fan.
For bathrooms between 50 and 100 square feet, estimate approximately 1 CFM per square foot.
If your bathroom is larger than 100 square feet, tally the CFM requirements for the individual fixtures to estimate your needs. Plan for 50 CFM for each toilet, tub or shower and 100 CFM for a jetted tub.
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