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Air Infiltration in Fuel-Fired Furnaces

How does a fuel-fired furnace operate?

Combustion products in fuel-fired furnaces are vented into the atmosphere through a stack or a chimney. As these products are mainly hot gases that are less dense and more buoyant than the ambient air, they rise creating a pressure differential between the bottom and top of the furnace. This differential is known as the thermal head and it produces a natural draft or negative pressure in furnaces and boilers.



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