The furnace’s introduction will cover the fundamentals, describing what each part is and what its functions are. It heats the heat exchanger, and after that, a fan blasts the heated air. There are different types of furnaces with different ratings dependent on the quantity of fuel they need to complete certain tasks. There are also different types of furnaces that have features like safety. The following will provide you with the complete explanation of these aspects. 99sqxntvdd.