Standardized terminology for combustion appliances

Standardized Terminology for Combustion Appliances and ...

Standardized Terminology for Combustion Appliances and Combustion Safety Testing Page 3 Concentrically Constructed Direct-Vent A direct-vent appliance that has an exhaust-gas vent and a combustion-supply air vent arranged in a concentric fashion, i.e., one vent is inside the other with a

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