Ceiling support box with outside air inlet

An ceiling support box coupling a first pipe to an inlet/exhaust a second pipe at an interface as part of an exhaust/intake system used with a heating appliance, wherein at least the first pipe includes an outer wall, an inner wall, and a first annular space defined between the outer wall and the inner wall, comprising:

• a frame (480) having a central circular opening formed in frame member having a top surface and a bottom surface;
• a frame insert (490) on the top surface and having a first circular opening corresponding with the central circular opening, an intake vent opening offset from the first circular opening, and a raised lip (490(b)) that creates a space between the frame and the frame insert;
• a cylindrical vent collar (414) having a top portion affixed to the frame at the central circular opening and extending a first height below the frame, with a first annular flange (414a) affixed to the vent collar at a bottom portion thereof, the first annular flange having a second circular opening;
• a cylindrical chase collar (410) having a top portion affixed to the frame and extending a second height below the frame and surrounding the vent collar, the second height being larger than the first height, with a second annular flange (411) affixed to the chase collar at a bottom portion thereof, the second annular flange having a third circular opening larger than the second circular opening;
• a cylindrical exhaust duct (424) coupled to the first annular flange (414a) of the vent collar and having a diameter corresponding with the second circular opening;
• the first pipe (370e) capable of coupling to the exhaust duct such that the inner wall thereof engages the first annular flange (424) of the vent collar and having a diameter slightly larger than the second circular opening, and the outer wall thereof capable of coupling to the second annular flange (421) of the chase collar and having a diameter corresponding with the third circular opening.

An structure coupling a stove pipe with a chimney pipe at an interface as part of an exhaust/intake system used with a heating appliance, wherein at least the stove pipe includes an outer wall, an inner wall, and a first annular space defined between the outer wall and the inner wall, comprising:

• a frame insert (490) engaging a frame, the frame housing the chimney pipe to exhaust the heating appliance through a first circular opening, the insert including a vent opening offset from the first circular opening;
• a stove pipe collar (420) adapted to couple with the stove pipe, the stove pipe collar having an outer stove pipe wall (421) and an inner stove pipe wall (424) with an annular space created between the inner wall and the outer wall to transport combustion air to a heating appliance from the vent opening, the outer stove pipe wall capable of engaging the outer wall of the stove pipe and the inner stove pipe wall capable of engaging an inner wall of the stove pipe, the inner stove pipe wall (424) coupled to the annular flange (411) and having a diameter corresponding with the second circular opening;
• a support box collar (410) surrounding the stove pipe collar (420) and forming an annular pathway therein between, the annular pathway forming a combustion air path between the vent opening and the first annular path between the inner and outer wall of the stove pipe;
• and
• wherein the structure is affixed in a support box such that the first circular opening is aligned with the chimney pipe and the stove pipe.