- 1). Turn off the circuit breaker to the exhaust fan. Remove the exhaust fan cover. Most covers come off by prying the edge with a flathead screwdriver, although you may have to remove some screws. Remove the exhaust fan motor and fan unit by unscrewing the screws that hold it to the fan housing. Remove the exhaust fan housing (the metal box that holds the motor and fan) by unscrewing the screws that attach it to the wood framing.
- 2). Measure the exhaust pipe behind the fan unit. Purchase an inline backdraft damper in the same diameter as the exhaust pipe.
- 3). Use the saw to cut open the wall or ceiling, if necessary, to give yourself enough room to work on the exhaust pipe. Using a hacksaw, cut off enough exhaust pipe to fit the inline backdraft damper in place of the pipe you removed.
- 4). Attach the inline damper to the existing pipe with two sheet metal screws and duct tape, with the airflow arrow on the damper pointing away from the exhaust fan. Attach the exhaust fan housing to the inline damper with two sheet metal screws and duct tape.
- 5). Repair the wall or ceiling with drywall and plaster, if you cut it open. Replace the exhaust fan, motor and cover. Turn on the circuit breaker and test the fan.
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