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Shut off the power to the circuit. Use a stud finder to locate a joist and mark the outline of the fan on the ceiling. Cut the opening with a drywall knife or rotozip (Image 1).
Wire the fan according to the manufacturer's instructions (Image 2).
Attach the fan to the joist with screws (Image 3).
Allow a gap between the fan and insulation, if required by the manufacturer and local codes. Attach the duct to the fan body (Image 1).
Drive a nail through the roof to mark the center point of the ductwork (Image 2).
Trace a hole for the roof cap piece on the roof. Score the opening with a utility knife (Image 3).
Follow the score line and cut the opening with a jigsaw (Image 1).
Remove shingles from around the opening (Image 2).
Apply roof cement on the cap flange and install by slipping under the shingles and nailing in place (Image 3).
Excerpted from Do It Yourself Home Improvement
© Dorling Kindersley Limited 2009
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