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- Used primarily to extract stale air from an attic, kitchen or bathroom.
- Kitchen fans are installed above the kitchen range or under the range hood and prevent smoke and grease from accumulating in the kitchen and spreading throughout the house. A switch simultaneously starts the fan and opens an outside vent.
- Bathroom fans may come with an optional light or heater and are used to expel steam and odors from the rooms.
- Should carry certified sound ratings developed by the Home Ventilating Institute and its member manufacturers. Ratings are in steps of 0.5 sones and 10 (CFM) cubic feet per minute. Limits for sound outputs are 6.5 sones for bathroom fans and 9 sones for kitchen fans up to 500 cfm.