Hook up bathroom fan


  1. Buying a Bathroom Exhaust Fan
  2. How to Install a Bathroom Vent Fan
  3. How to Install a Bathroom Fan (with Pictures) - wikiHow

From inside the attic, select a spot on the sidewall for the flexible duct to exit the house. The location should be between two wall studs and within 6 feet of the vent fan. Take a couple of reference measurements so that you can locate the spot from outside—from a nearby window, soffit, or other feature you can access from outdoors. From outside, slide the wall cap into the duct hole and push it tight against the house siding. Cut a foam-rubber gasket to fit into any spaces where the wall cap doesn't contact the siding.

Buying a Bathroom Exhaust Fan

Remove the wall cap and apply a bead of silicone adhesive to the siding and gasket around the hole. Slide the wall cap into the hole and press it against the siding. From the bathroom, unscrew and remove the blower motor from the vent fan housing. Next, unscrew the built-in receptacle from inside the housing to expose its wiring. Again, save the screws. Use wire nuts to join same-color wires with the ones from the electrical cable you fed into the housing in Step 5: Wrap the bare copper wire under the green grounding screw inside the housing and tighten the screw.

Place the electrical receptacle back into position and secure it with the two screws removed from it earlier. Raise the blower motor up to the ceiling, then push its plug into the electrical receptacle inside the housing. Hold the fan's plastic grille close to the ceiling. Slip the grille's mounting wires into the slots inside the fan housing. If the grille doesn't hold tight against the ceiling, spread apart its mounting wires to create more tension. Skip to main content. Can escalate to challenging, depending on how easy it is to run the duct to the outdoors. Required Tools Shopping List.

Want to hire a pro for this project? This Old House has partnered with HomeAdvisor to connect you with trusted home improvement pros! Remove the knockout hole on the side of the fan's housing and attach a cable connector. Slide the four metal brackets into the tabs protruding from the sides of the vent fan. Set the vent fan down into place between the joists, centered on the ceiling hole. Use foil duct tape; unlike fabric duct tape, it won't deteriorate over time. Fully extend the brackets until they come in contact with the sides of the joists.

Mark the hole location on the siding, using the reference measurements. Cut the duct hole through the house wall using a 4-inch hole saw. After securing the wall cap to the outside wall, move into the attic. Grab the free end of the flexible exhaust duct and carefully stretch it to the outside wall.

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Attach the duct end to the wall cap's connector duct with foil duct tape. Fasten the inch-long connector duct to the wall cap with foil duct tape. Secure the motor to the housing with the screws removed from it earlier. Push up on the grille until it's tight against the ceiling. Turn the power back on and test the fan. How to Install a Bathroom Fan.

This Old House general contractor Tom Silva shows how to properly install a roof-mounted bath-fan vent. This Old House plumbing and heating expert Richard Trethewey shows how to install a new water heater when there's no How to Install a Range Vent Hood. Find a suitable exit point for the duct pipe.

The next step is to find the shortest, straightest route from the housing fan to the outside. The longer the duct pipe is, the less efficient the fan will be. It is essential to vent the fan exhaust outdoors. Venting it directly into the attic would promote mold growth and potentially cause the rafters to mold. Just make sure the duct pipe is as straight as possible and that it won't be stretched too tightly. Attach the vent cap. The process for attaching the vent cap will vary depending on whether the exit point is on the roof or sidewall.

If your exit point is on the sidewall, pick a point between two wall studs and take some reference measurements on the inside so you can locate the same point on the outside. Use a 4-inch hole saw to cut through wall from the outside, then secure the vent cap in place. If your exit point is on the roof, draw an appropriate sized circle on the inside and use a reciprocating saw to cut it out. Then get on the roof taking all of the proper safety precautions and remove the shingles covering the newly cut hole.

Install the vent cap, using roofing cement and roofing nails, then replace any loose shingles. Move back into the attic and attach the end of the duct pipe to the vent cap's connector duct using foil duct tape. Wire the connections in the housing unit. Depending on the type of fan, you may need to wire the connections from the attic or from the bathroom. Make sure to read the manufacturer's instructions and double check that the power is off before proceeding.

Open up the housing unit and pull out the fan wires from the electrical splice unit. Twist the same color wires together usually white to white and black or red to black and add the connectors. Wrap the bare copper wire around the green grounding clip or screw and tighten to secure. Place the wires back in the electrical splice unit and reattach the cover.

If you don't feel confident about doing the wiring yourself, don't hesitate to call in a licensed electrician to install the fan or simply inspect your work when you're done. Also be aware that aluminum rather than copper wiring requires special handling and any electrical work involving this type of wiring should be undertaken by a professional. Now you're almost finished. Plug the blower motor into the electrical receptacle and secure it with the screws provided. Install the decorative plastic grille by slipping its mounting wires into the available slots in the housing unit.

Make sure it sits snugly against the ceiling -- spread the mounting wires a little to create more tension, if necessary. Turn the power back on and test your new bathroom fan to make sure it's working. Turn off the power. Before you begin, you will need to turn off the power to the fan from the circuit breaker box. Unplug the motor and disconnect the wiring. Put on a pair of gloves, safety goggles and a respirator and remove the grille covering from the old fan. You may be shocked at the amount of dirt and debris that fall out of it!

Unscrew or unplug the motor blower assembly from the housing unit, then open up the electrical splice unit and carefully pull out the wires. Remove the connectors and untwist the wires to disconnect them. It's a good idea to double check that power to the wires is off before doing this. Loosen the cable clamp to free the electrical cable from the fan housing.

How to Replace and Install a Bathroom Exhaust Fan

Go to the attic and remove the housing. In the attic, detach the duct pipe from both the housing unit and the vent cap connector duct. Pull the electrical cable and wiring free from the housing unit. Use a power drill to remove the screws securing the old fan's brackets to the joists, then lift the old fan from the ceiling.

Install the new fan. Head back down to your bathroom and remove the new fan from its packaging. If it has the same measurements as your old fan, you will be able to install it immediately. But if the new fan is bigger than the old one, you will need to enlarge the hole in your ceiling. You can do this by tracing the outline of your new fan onto the ceiling, then cutting around the outline with a drywall saw. If your new fan is smaller than the old one, you can caulk around the edges of the housing unit to fill in any gaps once the fan is installed.

Go to the attic and lower the new fan into the preexisting or newly enlarged hole.

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Make sure the unit is properly oriented for all electrical and duct work connections. Slide out the extendable mounting brackets and secure them to the joists using your power drill and 1 inch 2. You may need a helper to hold the fan in place from below as you do this.


How to Install a Bathroom Vent Fan

Once the fan is in place, connect a 90 degree duct elbow to the fan's exhaust port using sheet metal screws. Then attach a new 4 to 6 inch It is possible to use the duct pipe from the old fan, but if it is less than 4 inches However be aware that using a smaller, older duct pipe will prevent the fan from working as efficiently. Insert the electrical cable through the new fans connector and secure it with a cable clamp. Open up the electrical splice box from either the attic or the bathroom, depending on the model and pull out the fan wires. Attach the electrical wires to the fan wires by twisting same color wires together white to white and black or red to black and attaching a wire connector.

Wrap the bare copper wire under the ground clip or screw and tighten to secure. Tuck all of the wires back into the electrical splice box and replace the cover. Complete the outdoor work. If you replaced your old duct pipe with a newer, bigger pipe, you will also need to install a larger vent cap on your roof or sidewall. Take whatever safety precautions are necessary for working at a height. Remove the old vent cap and use a saw to enlarge the opening to the size of the new duct pipe.

Secure in place with sheet metal screws and seal around the edges with caulk. Secure the new vent cap over the end of the duct pipe.

If the vent pipe is on the roof, replace any shingles that may have come loose. Return to the bathroom and install the motor blower assembly by plugging it into the receptacle and screwing to secure. Attach the decorative plastic grille, then turn the power back on to test if your new bathroom fan is working. I have ventilation in my bathroom, can I still install an exhaust fan? Yes you can, and yes you should.

Ventilation only blows "bathroom air" around the house - exhaust takes that air and ejects it outside. It is important to create negative pressure in bathrooms and kitchens by forcing air out of the room through the vent, which in turn draws "clean" air into the room. Not Helpful 0 Helpful 6. Wire it utilizing the same circuit of the lights. Not Helpful 6 Helpful Not Helpful 0 Helpful 1. Can I install a bathroom fan over a bathtub or shower stall if I want?

Not Helpful 0 Helpful 0. Can we send the exhaust from a bathroom extractor fan out through a chimney flu? You are extracting steam and depositing it into a chamber originally built for gases.

How to Install a Bathroom Fan (with Pictures) - wikiHow

This would cause any deposits on the chimney flu to be reduced to a running liquid that would find its way into the fireplace, or, if they're sealed off, staining and a very bad sooty smell. Don't use the old flap. Instead, install a new flap according to the new fan's instructions. I am replacing a bathroom ventilation fan. The old fan has three wires, but the new fan has five wires two black, two white, and one green. What should I do with the double color wires? It sounds like your exhaust fan has a light built into it or another device. Wire the two blacks and the two whites in the fan to the black and the white on your supply line.

The green goes to your bare copper wire. If you want your fan and secondary device to be on separate switches, then you have to split them up and connect each black to its own switch. The whites depend on what you have for wiring.