Wire a Bathroom Vent
In a typical configuration, a bathroom ventilation fan is wired just like a ceiling-mounted light fixture that's controlled by a wall switch. The fan switch connects to the source circuit at the existing switch box for the bathroom light, and a new cable runs from the fan switch to the fan housing in the ceiling. It's easiest to run the circuit cable (and install the fan) if you have attic access above the bathroom ceiling. Otherwise, you may have to remove drywall in a couple of places to complete the job.
Instructions
1. Shut off the power to the source circuit at the home's service panel (breaker box). Install the vent fan housing and ductwork, as appropriate, following the manufacturer's directions.
2. Install a new switch box next to the existing box or replace the existing box with a larger box.
3. Install circuit cable between the switch box and the fan housing, and secure the cable ends to the box and housing with cable clamps. Use 14-gauge, 2-wire, nonmetallic cable (14/2 NM) for a standard 120-volt, 15-amp circuit. If necessary, also install cable between the new and existing switch boxes. Anchor all cables to the wall and ceiling framing according the requirements of the local building code.
4. Connect the new switch to the source circuit and new fan cable, following the manufacturer's wiring diagram (fans can be controlled by a standard single-pole switch or, with some models, a timer switch). Install the switch into its box, then add the switch cover plate.
5. Follow the fan manufacturer's wiring diagram to connect the new cable to the fan's motor unit. Complete the fan installation as directed.
6. Turn on the power to the source circuit and test the switch and fan for proper operation.
Tags: , circuit cable, Bathroom Vent, cable between, existing switch, , Install switch