Kitchen Exhaust Fan Wiring

By Dave Rongey - Summary:

How are the wires connected for a kitchen exhaust fan? Wiring a kitchen exhaust fan that is installed above the kitchen range or cook top stove.

Kitchen Exhaust Fan Wire

Electrical Question: How are the wires connected for a kitchen exhaust fan?

  • The exhaust fan has three wires out of the winding: red wire, black wire, green wire.
  • The way it is wired now when the switch is ON the air exhausts out of the kitchen.
  • When the switch is OFF the fan blows air into the kitchen. The result is that the fan motor can blow in both directions.
  • Can you explain the proper wiring for the two terminal connections, or provide a diagram that shows the wiring connections with the main circuit power.

This electrical wiring question came from: Steve located in Dallas, Texas.

See more about Home Wiring for Texas

Dave’s Reply:
Thanks for your electrical wiring question Steve.

How to Wire a Kitchen Exhaust Fan

Application: Wiring a Kitchen Exhaust Fan.
Skill Level: Intermediate to Advanced, best installed by a licensed electrical contractor.
Tools Required: Basic Electricians Pouch Hand Tools and a Voltage Tester.
Estimated Time: Depends on personal level experience, ability to work with tools and the access to the wall switch for the exhaust fan and if a larger switch box will be required.
Precaution: The kitchen exhaust fan circuit should be identified, turned OFF and Tagged with a Note before working with the wiring.
Notice: Modifying existing wiring or installing additional bathroom electrical wiring should be done according to local and national electrical codes with a permit and be inspected.

Wire a Kitchen Exhaust Fan

Specific to this Electrical Question: The wiring for the exhaust fan as described in this question may not be typical or standard due to the described problem. Therefore I recommend a close evaluation of the exhaust fan and the provided installation instructions and wiring diagram. If it is found that the exhaust fan is faulty or is not compatible with your application then a replacement may be desired.

  • Important: Not all exhaust fans are alike, so be sure to consult the documentation provided with your exhaust fan for specific circuit requirements and wiring instructions.

EXAMPLE: The following is an example of How to Wire a 120volt Kitchen Hood Exhaust Fan.

  • Wiring a Kitchen Hood Exhaust Fan
    • Typically there is an electrical circuit cable that is stubbed out of the wall just below the cabinet above the range or stove top.
    • Locate the circuit breaker that controls the power to this cable and turn the circuit off before installing the exhaust fan.
    • Note: The circuit cable used for the kitchen exhaust fan is typically fed from one of the kitchen outlet circuits.
    • Use a voltage tester to ensure that the circuit power has been shut off before proceeding.
    • The 120volt circuit wires include a green or bare ground wire, white neutral wire, and a black power wire.
    • A junction box is located inside the exhaust fan with a blank cover over it. Remove the blank cover.
    • The typical 120volt exhaust fan has a green ground wire, white neutral wire, and black power wire.
    • A half inch opening is provided for the cable to enter into the junction box. Note: A plastic bushing or a cable connector should be installed to protect the circuit cable.
    • Guide the circuit cable into the junction box of the exhaust fan while installing the exhaust fan to the cabinet.
    • Once the exhaust fan is installed and secured into place, remove any excess lengths of cable and wire but be sure to allow enough wire to make the wire connections. Strip off one inch of insulation from each wire to prepare the wires for connections.
    • Important: If a green ground wire is not provided with the exhaust fan then a green ground screw will be provided inside the junction box where the circuit ground wire must be attached.
    • Connect the matching pair of wires together from the exhaust fan to the circuit cable. Trim off any excess or uneven length of wire. Install a twist on wire connector to each connection.
    • Replace the blank cover over the junction box inside the exhaust fan.
    • Restore the circuit power to the exhaust fan.

More about Electrical Wiring for a Kitchen Hood Exhaust Fan

kitchen exhaust fan

  • Kitchen Hood Exhaust Fan

    • A kitchen exhaust fan located over the range or cook stove will provide a well ventilated kitchen to prevent odors from entering other areas of the home.

More about Kitchen Hood Exhaust Fan

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FAQs Frequently Asked Questions and Comments

9 Responses to “Kitchen Exhaust Fan Wiring”
  1. Harry says:

    Thanks Dave will try that.

  2. Dave Rongey says:

    Hi Harry,
    Wiring Two Switches to Control an Exhaust Fan
    To wire the exhaust fan so it will operate from two separate switch locations please refer to the Three Way Switch Wiring Diagrams. Note: Here in the USA this type of control is identified as Three Way Switches, even though there are only two switches involved.
    The adaptation of three way switch control in a 240 volt circuit would be to wire one wire of the 240 volt circuit through the three way switches, or use a low volt control circuit which would control a 2-pole relay, and run the 240 volt circuit through the relay contacts.
    I hope this helps,

  3. Harry says:

    Hello Dave.
    Thank you for the information. But i was looking for the diagram on how to connect the fan to the two way switch. so that it can work like two way as mentioned above.
    I am aware that the green wire is earthing, but I am looking for the connection to the switch.
    Thank You

  4. Dave Rongey says:

    Thank you for the information about your Exhaust Fan Harry.
    Based on your information and the limited information available about the Crompton Greaves Clean Air fan I would think that if the rotation of the fan is incorrect then the two circuit wire connections could be reversed to correct the rotation. The home electrical system is 240 volts and the earth ground, so the green wire would be the earth connection.
    I cannot speculate about the copper wire that is outside the window, however since it is a copper wire it would be good to perform electrical testing to help obtain a positive purpose and identification.
    I hope this helps,

  5. Harry says:

    Hello Dave
    Thanks for your quick response.
    Lets see if I can answer all your questions.
    1. Its a Crompton Greaves Exhaust Fan.
    2. Not sure about the model number but it looks Crompton Greaves Clean Air Exhaust Fan Old one.
    3. The standard voltage here is 240 volts.
    4. There is no Bulb. No led in the FAN.
    Its a Old model Exhaust Fan which was working fine till yesterday and I had to remove the wiring and remove the fan as had some renovation work going on. Now the work is done and I forgot the connection.
    The Fan works like a two way. It has a low and High Switch. When the fan is in low state it does exhaust the air out, and when on high it blows the air in like a fan.
    The Fan has 3 wires coming out: Red, Green, and Black.
    The Switch has 3 connectors to connect the wires.
    I am not sure where to connect the main wires ( 240 volts + Neutral ) in the switch along with the fan wires.
    I am all confused and to add more to it. There is one copper wire nailed to the outside of the window not sure if it has to do something with the fan wires.
    Please help me out with the connections of the 3 fan wire as it should work the same way as it use to work. Both ways Fan + Exhaust.
    Thanks in advance.

  6. Dave Rongey says:

    Hi Harry,
    Wiring a Kitchen Exhaust Fan
    Could you please provide more information about the specific kitchen exhaust fan that you have?
    Such as:
    The Manufacturer.
    The Model Number.
    The Voltage.
    Also, describe if the exhaust fan has a one or two speed motor, and if there is one or more light bulbs inside the unit.
    This information will be very helpful,

  7. harry says:

    I have the same question as Shivkiranm has above. I am looking for the diagram and how to connect the fan. Thanks in advance

  8. Dave Rongey says:

    Hi Randal,
    Typically a range igniter outlet may be fed from one of the 20 amp GFCI counter top appliance circuits. You can verify this with your electrical inspector, but this should not be a problem.
    I hope this helps,

  9. Randall Long says:

    I have a gas range and needed power for the igniters & clock, but it was not recommended to tap into the gcfi counter outlets, so I wired up and bypassed the GFCI in the junction box.
    Now I have counters with GFCI and the range off the GFCI but both are on the same 20 amp breaker. Dose this sound right or do I need to redue before the inspection.
    Thanks R.Long, Fernwood,ID.


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