Install Bathroom Exhaust Fan Duct Through Roof

Install Bathroom Exhaust Fan Duct Through Roof: A Comprehensive Guide

Installing a bathroom exhaust fan duct through the roof is a crucial task that requires careful planning and execution to ensure proper ventilation and prevent moisture buildup.

Materials Required:

• Bathroom exhaust fan
• Ductwork (usually 4-inch or 6-inch diameter)
• Roofing cement
• Caulk gun and caulk
• Roof flashing
• Screws
• Drill
• Saw
• Safety glasses

Step-by-Step Instructions:

1. Determine the Fan Location:

Choose a location for the fan that is directly above the shower or toilet, at least 6 inches away from any obstructions.

2. Install the Fan:

Secure the fan to the ceiling using the provided mounting bracket and screws. Wire the fan according to the manufacturer's instructions.

3. Mark the Roof Hole:

Locate the fan's duct connection point and project a vertical line through the roof using a chalk line or string.

4. Cut the Roof Hole:

Use a saw to cut a hole in the roof along the marked line, making sure it is large enough for the ductwork and flashing.

5. Install the Flashing:

Position the flashing over the cut hole and secure it to the roof using roofing cement and screws.

6. Connect the Ductwork:

Insert the ductwork into the fan and secure it with caulk. Feed the ductwork through the roof hole and into the flashing.

7. Seal the Roof Penetration:

Apply a generous amount of roofing cement around the base of the ductwork and the flashing to prevent water infiltration.

8. Secure the Ductwork:

Use metal straps or hangers to secure the ductwork to the attic joists.

Additional Tips:

Wear safety glasses when working with sharp objects.

Use a duct booster fan if the fan cannot create sufficient airflow on its own.

Inspect the fan and ductwork regularly for any obstructions or damage.

Hire a qualified professional if you are not comfortable with the installation process.

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