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How to Install a Bathroom Exhaust Fan


exhaust-fan-wiring Summary: How to Install and Wire a Bathroom Exhaust Fan with Pictures and Step-By-Step Instructions to Guide You.




How to Wire a Bathroom Exhaust Fan


Electrical Wiring Video

How to Install Recessed Lights

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So Keep Watching So I Can Help You Wire it Right!


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A great home improvement is adding a bathroom exhaust fan or upgrading you existing unit to a quiet low noise bathroom exhaust fan. Your options include a heat lamp to help with warm up those chilly mornings.
Benefits of Installing a Bathroom Fan:

Helps to eliminate odors and steam which contribute to mildew and bring warmth to a cold bathroom.

Optional units to consider:

Heat Lamps - (1 or 2 lamps) Heat with Blower - (will require a separate circuit).


Electrical Tip:

Install a bathroom exhaust fan to get rid of steam and odors
or consider:
Installing a bathroom exhaust fan with an optional heat lamp to warm up those chilly mornings.

Lighted Bath Exhaust Fan

Steps to Install a Bathroom Fan

OPTION: Upgrade your existing bathroom exhaust fan to a Heat Lamp Exhaust Fan.
Replace the noisy worn out exhaust fan with a unit that provides additional warmth on those cold mornings.

REMEMBER: Safety FIRST - Never Work On Energized Wires!

PARTS POWER SOURCE PROCEDURE DESTINATION
Safety

Identify and

Shut Off the Circuit

Lock Out & Tag Off

at Power Source

Use approved

wire connectors

Power

Existing Light Circuit

Install Electrical Wire

Controlling  Switches

Volts

120 volt

- 120 volt - 15 amp Rated Devices
Amps

15 or 20 amp

Match the Existing
Wire Gauge

Bond the

Ground Wires

Wire

Type-NM Cable

14/2 or 12/2 Wire Use Wire Connectors
or Plastic Bushing
Box 1 Gang Switch Box - 2 Gang Plastic
Cut-in box
Switch Single Pole - 2 Single Pole
Switches
Device Use Stud Finder
to Locate Ceiling Joists
Locate bathroom exhaust fan unit in open ceiling joist bay Example:
Broan Model 162
bathroom exhaust fan
Venting Check Size of Vent Fitting Install Flex Duct and Tape Joints Exhaust Vent to Outside Ridge Venting or Side Vent Adapter

How to Install a Bathroom Exhaust Fan - the Basic Procedure

Locate the power source, install the box and switch, locate and mount bathroom exhaust fan unit and vent.

IMPORTANT:
See Special Instructions about
How to Vent a Bathroom Exhaust Fan

Exhaust Fan Installation Pictorial and Summary


Click on the images to enlarge

Preparation

Broan Exhaust Fan exhaust fan trim plan the opening cut in switch box

Rough In Wiring

Cut in opening exhaust vent flex exhaust fan flex duct switch box

Install the Exhaust Fan

painted opening mounted heat fan cover spring exhaust fan unit trim

Install the Switch and Cover

GE Heat Lamp heat lamp trim single pole switch mount switches

More about Wiring an Exhaust Fan




» You Can Avoid Costly Mistakes! «

Here is How to Do It:
Wire It Right with the help of my Illustrated Wiring Book

Great for any Home Wiring Project.


  electrical wiring  

Complete Guide to Home Electrical Wiring

Perfect for Homeowners, Students,
Handyman, Handywomen, and Electricians
Includes:
Wiring GFCI Outlets
Wiring Home Electric Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring Light Switches
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
How to Troubleshoot and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
NEC Codes for Home Electrical Wiring
....and much more.



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Frequently Asked Questions about Wiring a Bathroom Exhaust Fan and Light

Adding an Exhaust Fan to a Bathroom


Question:
I currently have a single pole switch in a bathroom that works a light fixture. The power source goes to the light first and then to the single pole switch so the white is actually the hot. This is the only wire to this box. I have added a bathroom exhaust fan and replaced the single gang box with a double gang box in order to add another single pole switch in the same box.

I would like to use the power from the original light switch to run the fan independently from the light. Both the light and the fan are running on romex with 2 wires plus the ground. I cannot seem to wire the box correctly to make both switches work independently. Can you tell me how to do this?

Dave's Answer:
Lets Begin By Focusing on the Power Source
You have identified that the power source which is at the existing light fixture which will be extended to the new exhaust fan. At the existing light fixture junction box, make sure to identify the existing cable that leads to the light switch and either wrap black electrical tape on the white wire or color part of the white wire with a black felt pen. This is to clearly show that the existing cable to the switch is being use for the light switch only so there will not be any confusion about the wires of that cable.

Power Source to the New Exhaust Fan
A new cable will need to be installed between the existing light and the new exhaust fan. Switch for the Exhaust Fan From the new exhaust fan a cable will need to be installed from the exhaust fan to the double switch box. Make sure to identify the new cable that leads from the exhaust fan to the double switch box and either wrap black electrical tape on the white wire or color part of the white wire of the cable with a black felt pen. Now that the white wires that are used for the switches of the light and the exhaust fan have been identified with black, lets concentrate on the white wires that are the actual neutral wires.

White Neutral Wire Connections
The incoming white / neutral wire from the power source will splice with the white / neutral wire of the light fixture and the white neutral wire of the new cable that extends the power source to the new exhaust fan. The white / neutral wire of the extended power cable at the exhaust fan splices with the white / neutral wire of the exhaust fan.

Exhaust Fan Switch Wiring Connections
Keep in mind that a switch is just a loop of the hot leg of the power source which is accomplished by using a 2-wire cable as you already have with the existing switch for the light fixture. With this in mind, the black of the power source to the exhaust fan splices with the white wire (which has been colored black to show that it is being used for the switch). The black of the cable being used for the new exhaust fan switch splices with the black lead wire for the new exhaust fan.

Connections to the New Exhaust Fan Switch
Single pole switches typically have two side screw terminals and or push in connections on the back of the switches, the side terminals are typically a better connection than the push in connections. It does not matter which wire of the pair used for the switch is attached at the terminals because the switch is not polarity sensitive, the switch is simply a contact.

Ground Wires
The ground wires of the cables should be bonded to the junction boxes and switch boxes if these boxes are metal and or have a provision for a ground wire attachment which is typically identified by a green screw. A ground wire should also be attached to the green ground screw which may be found on the frame of the switches.

A Basic Summary for Installing this Bathroom Exhaust Fan
Basically you will have the same wiring configuration as the existing light and switch, except there will be the added cable between the light fixture and the exhaust fan, so the key is to identify each cable and what the individual wires of each cable are used for.

PLEASE NOTE:
The circuit should be positively identified and the circuit should be shut OFF before any wiring is performed.
The wire gauge or wire size of the additional cables must match the existing wire size.
The installing of additional electrical wiring may require a permit and inspections.
Please consult your local building department for further information.

New Bath Exhaust Fan with Timer Switch and a Light Switch


Becky, from Beloit, Wisconsin asks:
Hi Dave. I'm installing a new bath exhaust fan with 1 timer switch and a light switch. I have power coming to the switch box but nothing going to the fan/light. Do I use a 3 wire? I need a full explanation of this-my brain doesn't work well. How to hook up light switch and how to hook up timer; then how the wires hook up at fan.
Thanks!

Hi Becky,
You are absolutely correct about the 3-wire cable, lets review the process:
So, your source power source, (hot, neutral and ground) is located at the switch box where you will have two switches, one for the light and the timer for the fan.
Next, the 3-wire cable is installed from the switch box up to the exhaust fan. The 3-wire cable needs to be the same wire gauge or size as the power source cable, which is either #12 or #14.
Note: The 3-wire cable is actually 3-insulated wires, black, red, white and a ground wire.

At the Switch Box
The power source white / neutral wire will splice with the white / neutral of the 3-wire cable leading to the fan. If the timer switch that you have requires a neutral wire then it too will be spliced with the other neutral wires mentioned above.

The black / hot of the power source will be shared for both of the switches, so because you have two separate switches then two separate pieces of black wire will splice to the power source black wire, however if the time switch has lead wires then the LINE (typically the black) wire from the time switch will connect with one additional black wire that will share the black wire of the power source for the time switch and the light switch.

The ground wires all splice together, and an additional ground wire should be added to connect to the light switch, and the time switch unless the time switch has a green ground lead wire.

Lets make the Black wire of the 3-wire cable for the Light of the exhaust fan, so the black of the 3-wire cable wire will attach to the single light switch. Lastly, we have the Red wire of the 3-wire cable that will be used for the Exhaust Fan, so the red wire of the 3-wire cable will attach to the timer switch or splice with the red wire of the time switch (or other color wire as described in the instruction sheet that came with the time switch).

* Refer to the instruction sheet that came with the time switch for specific wire color assignments if the switch has lead wires.

Connections at the Exhaust Fan Junction or Splice Box
There should be a green ground wire already provided for the ground wire of the 3-wire cable, or there will be a green ground screw where you will attach the ground wire of the 3-wire cable .

There will be either one or two white wires that are used for the light and the fan, and these white wires splice to the white wire of the 3-wire cable. The lead wire for the Light splices to the black wire of the 3-wire cable. The lead wire for the Exhaust Fan splices with the red wire of the 3-wire cable.

* Refer to the instruction sheet that came with the exhaust fan for specific wire color assignments.

Make sure to positively identify the circuit and turn the circuit OFF before performing any work.

Basics of Installing a Bathroom Exhaust Fan


I just had a quick question about installing a bathroom fan. I currently have one light switch with a single outlet on it i want to install a bathroom fan. I just need to know how to go about running the electric for it and what kind of outlet I need.
The existing box is typically replaced by a two-gang box to accommodate a switch for the bathroom fan. A cable is installed from the switch box to the location of the new bathroom fan. The exact method and materials will depend on several factors of the home and the existing circuit cable.

Wiring a Bathroom Exhaust Fan and Switch

Do I need a neutral wire between switch boxes for the circuit wiring? How to Install a Bathroom Exhaust Fan and Electrical Wiring for Switches.


Bath Exhaust Fan Wire Connections

How do I wire the wall switch wires for my bathroom exhaust fan wires? Wiring Connections for an Exhaust Fan, How to Connect the Wires of a Bath Exhaust Fan.


Wire a Inline Exhaust Fan for Two Bathrooms

I purchased a Fantech inline exhaust fan, I want to wire separate switches in two bathrooms to control the same exhaust fan.


Wiring Connections for a Heated Exhaust Fan

How to Check an Exhaust Fan Heater that Stopped Working: The circuit wiring for many heater exhaust fan units have temperature sensors installed and may be part of the blower circuit wiring which ensures that air movement is occurring to prevent a high temperature occurrence.


Wiring a Bathroom Exhaust Fan Light Combo

How to Install Wiring for a Bathroom Exhaust Fan – Bathroom Exhaust Fan Heater Electrical Wiring – The white neutral wires would be tied together at the wall switch box. Understand that this is a typical wiring scenario, however the actual wiring connections may be different for your specific unit.


Wiring for a Bathroom Exhaust Fan

The Basics of Installing Electrical Wiring for a Bathroom Exhaust Fan: Answers to all of your questions about installing a bath exhaust fan and your bathroom exhaust fan replacement project.


See more at the Electrical Questions Category Listing.


Electrical Tips to Help You Wire it Right

The Safest Way to Test Electrical Devices and Identify Electric Wires!

The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

The Quickest Way to Check for Faulty Electrical Wiring!

The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.

Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!

The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..

The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.

electrical parts

Residential Electrical Parts and Accessories


Light Switches

120volt Outlets

Circuit Breakers

Electrician Tools

Voltage Testers





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