The gas exchange termination assembly overcomes the affects of fluid turbulence caused by wind, drafts, and air pressure. The invention can be applied to gas burning devices under 4,000 BTU input. Turbulent flow of gases at the gas exchange termination assembly are mitigated by the location of slots and openings in the gas exchange termination assembly for both intake air and exhaust gases. The gas exchange termination assembly is connected, coaxially through the building structural wall, to a sealed combustion system in order that all gases are drawn from and return to the same general location (directly) outside the building. The gas exchange termination assembly includes an intake air hood for intake air with additional intake air openings, an exhaust pipe with slots and a plug to move products of combustion at angles to the concentric pipe as the intake and exhaust gases enter and exit.

The gas exchange termination assembly overcomes the affects of fluid turbulence caused by wind, drafts, and air pressure. The invention can be applied to gas burning devices under 4,000 BTU input. Turbulent flow of gases at the gas exchange termination assembly are mitigated by the location of slots and openings in the gas exchange termination assembly for both intake air and exhaust gases. The gas exchange termination assembly is connected, coaxially through the building structural wall, to a sealed combustion system in order that all gases are drawn from and return to the same general location (directly) outside the building. The gas exchange termination assembly includes an intake air hood for intake air with additional intake air openings, an exhaust pipe with slots and a plug to move products of combustion at angles to the concentric pipe as the intake and exhaust gases enter and exit.

Described herein is an apparatus and method for avoiding frost buildup on the air intake and or ice buildup on the ice condensing surfaces of the exhaust vent of a condensing appliance. The apparatus comprises a heat-conducting path that extends between the exhaust gas in the exhaust vent of the appliance, and the frost condensing surfaces at or near the air intake opening of the combustion air vent. The heat-conducting path has a first section in thermal contact with the exhaust gas and a second section in thermal contact with the frost condensing surfaces at or near the air intake. In one configuration, the heat-conducting path is a heat pipe. In one configuration the heat-conducting path is a heat exchanger assembly. The passive transfer of heat energy via the heat-conducting path, from the exhaust gas to the frost condensing surfaces at or near the air intake, avoids frost buildup.

Described herein is an apparatus and method for avoiding frost buildup on the air intake and or ice buildup on the ice condensing surfaces of the exhaust vent of a condensing appliance. The apparatus comprises a heat-conducting path that extends between the exhaust gas in the exhaust vent of the appliance, and the frost condensing surfaces at or near the air intake opening of the combustion air vent. The heat-conducting path has a first section in thermal contact with the exhaust gas and a second section in thermal contact with the frost condensing surfaces at or near the air intake. In one configuration, the heat-conducting path is a heat pipe. In one configuration the heat-conducting path is a heat exchanger assembly. The passive transfer of heat energy via the heat-conducting path, from the exhaust gas to the frost condensing surfaces at or near the air intake, avoids frost buildup.

A termination assembly for a chimney is provided having an exhaust layer with an exhaust tube adapted to receive exhaust air from an appliance. An outlet opening of the exhaust tube terminates in the exhaust layer. An intake layer is separated from the exhaust layer. The intake layer has an enclosure defining a positive pressure area within the enclosure and a plurality of openings. Each of openings has a cross-sectional area that decreases from an exterior surface of the enclosure toward the positive pressure area within the enclosure. An intake tube is adapted to receive intake air at an inlet opening positioned in the positive pressure area. The positive pressure area in the intake layer has a pressure greater than the atmospheric pressure outside the termination and in the exhaust layer to prevent flow in the exhaust tube from being reversed.

A termination assembly for a chimney is provided having an exhaust layer with an exhaust tube adapted to receive exhaust air from an appliance. An outlet opening of the exhaust tube terminates in the exhaust layer. An intake layer is separated from the exhaust layer. The intake layer has an enclosure defining a positive pressure area within the enclosure and a plurality of openings. Each of openings has a cross-sectional area that decreases from an exterior surface of the enclosure toward the positive pressure area within the enclosure. An intake tube is adapted to receive intake air at an inlet opening positioned in the positive pressure area. The positive pressure area in the intake layer has a pressure greater than the atmospheric pressure outside the termination and in the exhaust layer to prevent flow in the exhaust tube from being reversed.

A vent termination for a gas appliance is provided, the vent termination comprising: a back which includes an exhaust vent aperture for accepting an exhaust vent and an air intake aperture for accepting an air intake pipe; a cover opposite the back, the cover including a face and a margin, the margin surrounding the face, extending toward the back and including a plurality of slots, which are for fluid communication with an ambient environment and which form a grill; a base; a top opposite the base; sides attached to and extending between the back, the cover and the top; a frame surrounding the margin and attached to the margin; and a divider disposed between the exhaust vent aperture and the air intake aperture, the divider extending between the back and the cover and defining an exhaust chamber and an air intake chamber, the exhaust chamber in fluid communication with both the plurality of slots and the exhaust vent aperture, the air intake chamber in fluid communication with both the plurality of slots and the air intake chamber.

A vent termination for a gas appliance is provided, the vent termination comprising: a back which includes an exhaust vent aperture for accepting an exhaust vent and an air intake aperture for accepting an air intake pipe; a cover opposite the back, the cover including a face and a margin, the margin surrounding the face, extending toward the back and including a plurality of slots, which are for fluid communication with an ambient environment and which form a grill; a base; a top opposite the base; sides attached to and extending between the back, the cover and the top; a frame surrounding the margin and attached to the margin; and a divider disposed between the exhaust vent aperture and the air intake aperture, the divider extending between the back and the cover and defining an exhaust chamber and an air intake chamber, the exhaust chamber in fluid communication with both the plurality of slots and the exhaust vent aperture, the air intake chamber in fluid communication with both the plurality of slots and the air intake chamber.

The invention relates to an end line assembly (10) for a heating device (30) of a vehicle (42) fit for habitation, in particular a caravan, motorhome or ship, comprising: at least one exhaust-gas pipe portion (16-1, 16-2) for leading away exhaust gases of an associated burner of the heating device (30); at least one combustion air pipe portion (18) for feeding combustion air to an associated burner of the heating device (30), the exhaust-gas pipe portion (16-1, 16-2) and the combustion air pipe portion (18) being parallel to one another and immovable in a sleeve portion (20), the outside (22) of which delimits the line assembly (10) with respect to the surroundings.

A termination cap for a direct vent appliance. The termination cap comprises a an outer housing, an exhaust housing nested within the outer housing and a trim plate. The trim plate has an exhaust gas opening and combustion air openings and is securable to the exhaust body to allow exhaust gas to flow through the exhaust gas opening. At least a portion of the combustion air drawn through the combustion air openings is heated and exits through the top or upper portion of the trim plate to form an air wash along the wall surface within which the cap is mounted.