How to Install a Bathroom Exhaust Fan


Installing a bathroom exhaust fan is a project that can take a few hours to complete. The result is a properly ventillated bathroom that can be steam and odor free. The bathroom fan not only removes unwanted smells, mold and mildew, it can also reduces dander, dust and allergens.

Things You'll Need

  • Bathroom exhaust fan kit
  • Handsaw or reciprocal saw
  • Carpentry tools
  • Determine what type and model bathroom exhaust fan will be needed for the project. Some common models come with allergen-reducing filters; others are simple, utilitarian systems that only serve as fan-powered vents.

  • Find an area of the bathroom that offers a clear and definite route for venting. Most models found in home improvement stores such as Lowe's or Home Depot mount either in the ceiling or in the exterior wall of the home.

  • Cut the hole in which the exhaust fan will be mounted. Use a small handsaw or a reciprocal saw to cut an opening following the template tracing included with the bathroom exhaust fan. Cut a 1/8-inch in from the template edge. This allows room to remove more material if needed.

  • Look over the wiring leading to the bathroom main light. This is where you will wire in the exhaust fan. Connect the exhaust fan wiring to the house wiring following the wiring schematic provided with the fan.

  • Install the ventilation duct provided with the unit. The duct must run from the bathroom exhaust fan to a roof soffit that leads outside.

Tips & Warnings

  • When venting the unit, point the actual duct vent downwards where it leads outside to prevent rain or debris from entering the hose.
  • Understand the home's electrical wiring system before attempting to connect the bathroom exhaust fan.
  • Use extreme caution when working with carpentry tools. Wear eye protection and gloves at all times.
  • Never undertake any electrical work unless the electricity to the entire home has been suspended at the breaker box.

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