![]() Increase the height of the fireplace grate or of the fire basket. The heat exchangers were vented through brick or masonry chimneys. ![]() These furnaces consisted of cast-iron or riveted-steel heat exchangers built within an outer shell of brick, masonry, or steel. The first category of furnaces are natural draft, atmospheric burner furnaces. What category is a natural draft furnace? Forced draft fan, is used basically for providing the required quantity of hot air to the furnace for smooth and uniform combustion of fuel. …įorced draft(FD) :- A fan is used to force air into the boiler to provide more air for combustion. ![]() Forced draft means an exhaust fan placed at the base of the cooling tower which then causes overpressure. Induced draft implies an inlet fan placed on top of the cooling tower and the creation of low pressure. What is difference between induced draft and forced draft? It provides a direct intake vent that brings outside air to the sealed combustion chamber with one pipe, while a second vent pipe provides sealed venting of exhaust gases back to the outside of your house. What are the two PVC pipes coming out of my furnace?ĭirect-vent (two-pipe) system: The two-pipe system is most common in home heating applications.
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