How to Replace an Air Flapper on a Lennox G-14

The air flapper on a Lennox G-14 model furnace is connected to a gasket at the bottom of the air intake assembly. The air flapper helps control the air pressure within the furnace when it is being used. If the part becomes cracked or broken in any way, it will affect the performance of the ignitor in the furnace. You can replace a broken air flapper part at any time, and the new part can be ordered from Lennox.

Phillips screwdriver

Instructions

- 1
  Turn the thermostat to the lowest settings, and then turn off the electrical power to your furnace from your home circuit breaker.
- 2
  Remove the six screws from the bottom furnace cover using a Phillips screwdriver.
- 3
  Lift up the bottom furnace cover, and pull it off of the furnace. Lift out and remove the insulation. The air flapper is a metal cylinder part located in the bottom center below the purge blower.
- 4
  Remove the screw in the middle of the air flapper, and then pull out the entire air flapper.
- 5
  Insert a new air flapper back over the bottom gasket, and then reinsert the middle screw. Place the insulation back over the flapper.
- 6
  Place the bottom cover back onto the furnace, and reinsert all of the screws to the cover. Turn the electrical power back on from your circuit breaker.

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