What is the best way to install bathroom exhaust fan?

Project details

1. Step 1: Bath Vent Overview.
2. Step 2: Drill a Reference Hole.
3. Step 3: Mark the Ceiling.
4. Step 4: Cut the Intake-Port Hole.
5. Step 5: Position the Fan.
6. Step 6: Attach the Fan to the Joists.
7. Step 7: Cut a Duct Hole Through the Sidewall.
8. Step 8: Attach the Exhaust Duct to the Wall Cap.

How do you install a fan in a bathroom?

The next step in your bathroom fan installation is to attach the fan enclosure to the joist with screws. Cut or push back the insulation, leaving a 6-inch gap between the unit and insulation. Cut pieces of a 2 foot x 4 foot board to fit between the joists, blocking off the fan from the insulation. Attach wood pieces with screws.

How big of a fan do I need for a small bathroom?

Some manufacturers recommend the number of CFM based on square feet or cubic feet. Some manufacturers use the CFM formula below. Choose a fan 90 CFM or larger. As a general rule, small bathrooms typically require about 50 CFM, while large bathrooms require around 100 CFM.

How to calculate the CFM for a bathroom fan?

To calculate the CFM for your bathroom, multiply the room’s cubic footage (length x width x height). For example, if your bathroom measured 120 square feet, you would multiply that by the height of the ceiling (say 8′) to get 960. THEN divide by 7.5 to get a CFM rating of 128. You will find the CFM rating of a new fan printed on its box.

How to remove the vent pipe from a bathroom fan?

1 The vent pipe may be attached to the housing with HVAC tape. If so, peel this away. 2 The pipe may also be held in place by a clip or screwed assembly. Using a screwdriver if necessary, remove this as well. 3 Once the tape and/or clips are removed, just gently tug at the vent pipe until it is removed from the fan housing.

The next step in your bathroom fan installation is to attach the fan enclosure to the joist with screws. Cut or push back the insulation, leaving a 6-inch gap between the unit and insulation. Cut pieces of a 2 foot x 4 foot board to fit between the joists, blocking off the fan from the insulation. Attach wood pieces with screws.

Where can I buy an exhaust fan for my bathroom?

If your bathroom exhaust fan is old, buy a new exhaust fan on Lowes.com and use this video to learn how to replace the old bathroom fan. Full details here: Difficulty Level: Moderate. If you are not 100% confident installing an exhaust fan, Lowe’s recommends that you hire a professional.

Some manufacturers recommend the number of CFM based on square feet or cubic feet. Some manufacturers use the CFM formula below. Choose a fan 90 CFM or larger. As a general rule, small bathrooms typically require about 50 CFM, while large bathrooms require around 100 CFM.

Can a bathroom exhaust fan be vented into the attic?

If you have access to the attic, the fan can vent through either a gable wall or the roof. Letting the fan exhaust into an open attic will cause moisture buildup on the underside of the roof. Avoid venting through a soffit vent or ridge vent. The warm air will exhaust out the duct and enter back into the attic through the soffit vent or ridge vent.