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What's the difference between natural, forced and induced draft?

by Manage My Life Last activity date:
April 26th, 2007

What's the difference between natural, forced and induced draft?

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Appliances , Building Supplies , HVAC
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Burners in conventional gas furnaces are

natural draft

. This is sometimes referred to as an

atmospheric burner

. This means that we are not blowing any air into the combustion chamber to create an artificial draft condition (this is

forced draft

), nor are we pulling air through the combustion chamber on exhaust side, again creating an artificial draft condition (this is

induced draft

).

The amount of air seen by the burner is a function of the draft condition, which is largely determined by the chimney, and influenced by the convective heat from the burner. The chimney draft can change based on the temperature differences between indoors and out, and on the exterior wind strength and direction.
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April 26th, 2007
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