Had to fix a heater that had a bad exhaust motor. When this heater was installed the chimney did not have rain cap on it so some water got down the flu and started rusting out the motor and casing. Amazing what a twenty dollar piece of tin can prevent.
Old motor and casing.
New motor and casing.
Cleaned up the unit and mating surfaces before putting on a new fire proof gasket between the casing and heat box as well.
I also replaced all the exhaust pipe that was showing signs of wear.
Works like new again!