Carrier 334357-756 Secondary Heat Exchanger

The Carrier 334357-756 is a secondary heat exchanger, a key part in specific Carrier HVAC systems, most likely gas furnaces. Its use is to exchange heat between two fluids without intermingling of one with the other. In a gas furnace, the second heat exchanger is used to extract heat from the hot combustion chamber and then pass it to the air stream. This warmed air is then circulated around the building to give the required heat. The particular Carrier secondary heat exchanger is 7.4” long, 17” wide and 19.8” tall.