Patent ID: 8056552

Claim:
An interface for a wall opening as part of a heating appliance exhaust/intake system, wherein the heating appliance includes an exhaust outlet and a combustion air inlet, an exhaust pipe is coupled to the exhaust outlet, and an intake pipe is coupled to the combustion air inlet, comprising: a structure having a rigid surface enclosing a volume of space, including an outside end with an outside opening and an inside end with an inside opening, wherein the outside opening and the inside opening are aligned with each other and sized to receive the exhaust pipe therethrough; a first air intake vent formed through the rigid surface proximate to the outside end; and a second air intake vent formed through the rigid surface proximate to the inside end; wherein the structure is affixed to the wall opening such that the first air intake vent is positioned outside of the wall opening and the second air intake vent is positioned inside the wall opening, and wherein the intake pipe is coupled to communicate with the second air intake vent.