by 
The Curious Bag
-
<h4 class="dechead">On One Hand: Don't Go Too Small
Bathroom exhaust fans are available in a variety of sizes. If you choose a bathroom exhaust fan that is too small, it will provide inadequate ventilation and air movement. Larger bathrooms will need larger bathroom exhaust fans, as will bathrooms with features such as whirlpool tubs.
On the Other: Don't Go Too Large
Larger bathroom exhaust fans use more energy than smaller ones, leading to higher energy costs even for Energy Star qualifying models. Although most bathroom exhaust fans available today run fairly quietly, the noise level might be too great if you install a large fan in a small bathroom.
Bottom Line
Bathroom exhaust fans each have a cubic feet per minute (CFM) rating. This represents their air-movement capabilities. The National Ventilation Institute says if your bathroom is 100 square feet or less, choose a fan with a CFM rating equal to the square footage. For larger bathrooms, allow a CFM rating of 50 for each bathroom fixture (toilets, sinks and tubs) except whirlpool tubs, which need 100 CFM. Large bathrooms might need multiple fans, evenly spaced.
Source:
RELATED QUESTIONS
Copyright 2023, Wired Ivy, LLC