How to install a bathroom ventilation fan in the new construction

Ventilating fans of the bathroom to eliminate the harmful odors and humidity of the bathroom. Moisture in bathrooms leads to molding materials and wall damage and wood ornaments. Ventilation bathroom fans are available at most home improvement centers and electrical supply stores. They come in a wide variety of sizes and styles. To determine the size of the fan required for the bath, multiply the length and width of the bath to obtain the square footage. It is required per square foot of bathroom space – One CFM – cubic foot of air flow per minute. Local building codes may require a licensed electrician to install the fan.


  1. Remove the retaining screws of the fan motor from the new ventilation fan of the bathroom with a screwdriver. Pull the fan motor out of the fan housing and disconnect the electrical connection. The new ventilation fan in the bathroom consists of a fan housing and a fan motor; The fan motor must be separated from the fan housing in order to place the fan housing in the bathroom..
  2. Remove the knockout plug on the side of the fan housing with a screwdriver. Slide a cable connector into the hole of the knockout cap and screw the nut; tighten it with a pair of slot sliding pliers.
  3. Position the fan as close to the shower as possible. Aim with the exhaust port of the fan to the area where the exhaust fan will leave the house.
  4. Attach the fan housing to the roof joist and drive two wood screws through the mounting holes in the fan housing with an electric drill or screwdriver.
  5. Slide the two metal brackets on the fan housing and against the roof rafters and then level the fan housing with a torpedo level.
  6. Attach the two metal brackets to the roof rafters with wood screws and the electric drill or screwdriver.
  7. Slide a 4-inch flexible duct over the blower outlet hole and secure it to the exhaust port with aluminum tape.
  8. Run the 4-inch flexible duct to the soffit zone, supporting the duct with a plastic hanger duct strap every 2 feet.
  9. Slide the open end of the 4-inch flexible conduit over the end of a 4-inch metal conduit, the 90-degree elbow and secure it with aluminum adhesive tape. Face the elbow pointing down on the intrados.
  10. Slide the electrical cable through the cable connector and tighten the cable connector screws with the screwdriver.
  11. Connect the fan wiring to the electrical cable according to the manufacturer’s wiring instructions.
  12. Plug the fan motor into the electrical receptacle of the fan housing.
  13. Place the fan motor in the fan housing and the retaining screws with the screwdriver.