A furnace with a vertical air flow through the heat exchanger and the blower compartment beneath the heat exchanger is called an upflow.
Furnace is also known by the name of boiler or heater. In industrial terms, furnace is a large vessel made of usually or iron and is used in the production of certain metals copper, iron, etc. The task of the furnace is to generate heat, then transfer it to the desired substance and change its physical or chemical state. An upflow furnace takes in air from the bottom and releases it from the top.
Heat exchanger is a system that transfers the heat from one substance to another. They cab be used either for heating process or cooling process.
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