Fan Light
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Replacing bathroom fan, is additional wiring required to add a light?
I currently have a venting fan in my bathroom that does not have a light included. If I wanted to replace it with a fan/light, do I need to run additional wires for the light or will they work together with the existing wiring?
NO,
Just follow these instructions. Sorry for being wordy, but I assume others may read this too, and think it wise to be complete (even though you may know much of this) as some may not be aware of all the steps necessary.
Shut off the power to the circuit before you begin any work. Lock out the circuit or the panel so no one can turn the circuit on while you are working. From the attic (ceiling or wall), remove any insulation from above (or around) the area of the in which you plan to mount the fan. If you are replacing a light fixture with the fan unit, remove the existing fixture and disconnect all electrical connections. Carefully note which wire is hot and which is neutral. In case you need to, turn the power back on, after disconnecting, take your tester and touch one exposed wire to the tester and the other to the box. If you get a glow, its hot (usually black or red and label it) if not, it's a return (neutral, usually white and label it). Look for the ground as well (usually exposed copper or a green wire). You can always pigtail an additional connection for a separate unit if you wish. But nutting and securing the wires together will work just as well.
If possible, place the housing in a position which will allow you to fasten it directly to a ceiling joist. If this is not possible because of the location of the original light fixture, install a wooden braces between joists to provide a solid attachment point for the fan housing. Hold the housing in place against the ceiling and mark around it to define the perimeter of your cut. Drill pilot holes in the corners, and cut along the lines with a drywall saw or jigsaw. Secure the fan housing in place.
Run a length of cable from the existing light switch to the exhaust fan unit. If you wish to have separate switches operating the fan and light functions, use 3-wire cable. If your unit includes a heater and/or timer, additional cable may be required. Consult the manufacturer's instructions. This step is not necessary if you are replacing an existing fixture and do not require independent switch operation for the fan and light.
Make the necessary electrical connections at the fan unit using wire connectors. Follow the wiring diagram provided by the manufacturer. Simple fan installations may only require wiring bare copper to bare copper, white to white and black to black, while more elaborate units with lights and/or fans will require more connections. Attach the ground wire to the grounding clip provided on the housing. Push the wires into the wiring box area of the housing and install the cover. Connect the duct to the fan housing.
Follow the instructions of the unit's manufacturer regarding how far away from the fan the insulation should be kept. Some units allow insulation to be right next to the housing. Others, particularly those with lights or heaters, may require that you add dams between the joists to keep the insulation a minimum distance away from the unit. From inside of the bathroom, install the unit cover.
Wire the cable into the existing electrical circuit at the wall switch.
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