Push the combustion gases through the heat exchanger
A fan downstream from the heat exchanger is intended to
Attic
A furnace in an interior closet can have it's lower and upper combustion air sources vented to the.....
Defendant on the manufacturers instructions
Minimum clearance of a "B" vent to a combustible material is...
Thermocouple
All gas forced air furnaces must have a safety device that shuts off the gas in the event the pilot goes out called a.....