How to Select a Bathroom Ventilation Fan

The U.S. Department of Energy recommends that spot ventilation be provided in bathrooms. While controlling odor is one goal, a more important goal is controlling moisture to prevent buildup that can lead to mold and mildew growth. Bathroom ventilation fans also assist other whole-building ventilation and conditioning equipment to keep indoor air healthy. The American Society of Heating, Refrigerating and Air-Conditioning Engineers recommends that bathroom ventilation fans move air at 50 cubic feet per minute (CFM) intermittently.

Tape measure
Manufacturer's bath fan specifications

Instructions

- 1
  Measure the space available for the fan. If replacing an existing fan, remove the grill and note the locations of the outlet vent and electrical supply wire.
- 2
  Compare new fan dimensions to the space available. If replacing a fan, compare the locations of the outlet vent and electrical supply connection points on the fans being considered as replacements.
- 3
  Compare the noise levels of the various fans that will fit the space. A sound rating of 0.5 Sones or less would be most desirable. Fans with no sound ratings are probably noisy.
- 4
  Compare fan air movement, looking for 50 CFM minimum.
- 5
  Narrow your choices to three. If possible visit a home improvement store to look at and listen to the fans. Consider appearance. Consider what you can afford to spend.
- 6
  Buy the fan you can afford that fits the space, has the lowest Sones, meets at least the minimum CFM air movement and is aesthetically pleasing to you.

Types of Bathroom Vent Fans

DIY Duct Work

Ventilation