in Heat exchanger what cause the flu gases to separte from the regular combustion air that goes out to the rooms for circulation?
Think of it like a sealed tank inside of another sealed tank. The combustion chamber is a sealed unit with an exhaust pipe that goes directly to the flu pipe. The heat exchanger is a tank around the combustion chamber that is welded around the outside of the exhaust pipe. Cool air is forced into the heat exchanger where it is heated and blown out the duct work.
The combustion gases and the air that comes out of your vents never come into contact with each other. air is drawn by a fan, thru your return vents and forced thru a chamber that has two parts, one for the inside air and one for the heated gasses from the burner of your furnace, heat is exchanged from the combustion gasses to the inside air, the inside air is forced thru vents to heat the house and combustion gasses go out the furnace vent
The combustion air never circulates through the house. It is mixed with the fuel and is burned, becoming flue gas.
The heat exchanger is sealed air tight the fan blows air around the exchanger to to air ducts.The flue gases are inside the heat exchanger and go the the outside vent.if there is a hole in the exchanger you will get carbon monoxide in the heat ducts,very dangerous.If your not sure seek a pro. t
