DIY Network

Install a High-Efficiency Replacement Bath Fan and Light

Reduce your home's electrical bill by installing this energy-saving unit.

More in Electrical

  • Time

    Under Half Day

  • Price Range

    $1 - $50

  • Difficulty



Step 1: Choose a High-Efficiency Unit

This bath exhaust fan (Image1) uses just 20 percent of the energy required by a standard exhaust fan -- 20 watts vs. 100 watts -- for the same volume of air delivery.

The fan light (Image 2) uses compact florescent bulbs for additional energy savings. When running, this unit is also is much quieter than standard fans.

Step 2: Remove the Old Unit

Shut off the power to the existing fan and light fixture at the main circuit panel (Image 1).

Remove the fixture’s plastic cover.

Use a circuit tester to be sure all power to the unit is shut off.

Disconnect the electrical plug connector, and remove the old fan (Image 2).

From above, remove the screws that secure the unit to the ceiling joists, and disconnect the exhaust duct from the housing (Image 3).

Step 3: Enlarge the Existing Opening

Mark the outline of the new fan and light housing on the ceiling.

Use a drywall saw to enlarge the ceiling opening.

outline new fan and light housing on ceiling

Step 4: Install the New Unit

Screw the new mounting bracket to the ceiling joists, and connect the exhaust duct. Replace the old vinyl duct with a more efficient insulated duct (Image 1).

Insert the new fan and housing into the enlarged ceiling opening (Image 2). Two thumb-screws hold the unit in place temporarily.

Install screws through the housing into the ceiling joists (Image 3) to secure the unit permanently in place.

Use supplied screws to install the light fixture onto the blower unit (Image 4).

Install the new grill cover by inserting the spring clips into slots in the housing.

Make the electrical connections according to the manufacturer's instructions.

Once the wiring is complete, turn the power back on and check the operation of the fan and light.