Bathroom Exhaust Fan Ratings

The Home

Exhaust fans are essential to building ventilation. They help to lower energy costs and remove excess moisture. Here are some tips on ratings and replacement:

  • If you plan to replace an existing fan, look for one with an air movement rating of 50 CFM (cubic feet per minute) or more.
  • A 120 volt heater is ideal for home bathrooms – 250 volt units are designed for larger spaces and require special wiring.
  • Before replacing a bathroom ventilation fan, be sure the existing circuit can handle the amperage of the fan.
  • Measure to see if the new exhaust heater is big enough to cover the hole left by the old unit. Do not install a fan with a heater over the bathtub or shower.
  • Make the most of your time and money. Look for bathroom exhaust heaters that have built-in lighting.


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