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Abstract

An emission control apparatus which can be used on an outdoor wood-fired boiler. Ambient air, which has a much higher concentration of available oxygen in relation to exhaust gases, is caused to be heated before being passed through catalyst-coated media along with exhaust gases, thereby improving the performance of the catalytic reaction. An embodiment also relates to an emission control apparatus having a housing with an internal wall and an external wall, the internal wall defining an exhaust flow path and having a catalyst-coated media disposed therein, at least one ambient air duct disposed within the housing between the internal wall and the external wall, where each ambient air duct includes an air inlet in the external wall of the housing and an air outlet in the internal wall of the housing in communication with the catalyst-coated media, insulation disposed within the housing between the internal wall and the external wall, and wherein the at least one ambient air duct and insulation are positioned such that, during operation of the emission control apparatus, ambient air enters through the air inlet, travels upwardly through the air duct on a cool exterior side of the insulation before turning and traveling back down on a hot interior side of the insulation where the ambient air is heated from conduction through the internal wall of the housing before being introduced into the catalyst-coated media.

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First Claim