Importance

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Abstract

A heating appliance including a firebox having an inlet and an outlet, the firebox inlet and outlet in communication with a space containing ambient air and within which the appliance is located. A gas burner is disposed within the firebox and provides a flame, the flame supported by ambient air entering the firebox through the firebox inlet, the flame producing products of combustion which exit the firebox throught the firebox outlet. A catalyst element is in communication with the firebox outlet, and at least a portion of the products of combustion which exit the firebox through the firebox outlet are directed through the catalyst element. At least some of the products of combustion directed through the catalyst element are catalyzed, the catalyzed products of combustion being directed into the space in which the appliance is located. A plenum is in thermal communication with the firebox. Ambient air received from the space in which the appliance is located is conveyed through the plenum, the plenum having an outlet from which the air conveyed through the plenum is directed into the space in which the applicance is located. The ambient air being conveyed through the plenum is substantially out of fluid communication with the catalyzed products of combustion within the appliance.

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First Claim