Flue gas venting arrangement

Claim 2

A fuel burning apparatus for heating a fluid medium to be conditioned comprising: A. a housing having walls enclosing a fuel burner and a heat exchanger for passing the fluid medium to be heated in heat exchange relation with the hot gaseous exhaust of the fuel burner, said heat exchanger having a fluid heating side and having a combustion side including an inlet end for receiving heated gases from the fuel burner and an outlet end for discharging the hot flue gas therefrom, partition means within the housing forming a combustion compartment and a fluid heating compartment, a flue gas outlet tube communicating with the outlet end of the combustion side of the heat exchanger for receiving the hot flue gases discharged from the combustion side of the heAt exchanger, said flue gas outlet tube extending outwardly from one wall of the housing, a relief air opening formed in said one wall of said housing adjacent the flue gas outlet tube, said relief air opening communicating with the combustion air compartment in the interior of the housing; B. a flue gas cap disposed on said one wall of the housing over the projecting end of said flue gas outlet tube and said relief air opening, said flue gas cap having a parallel baffle disposed parallel to and in spaced relation with said one wall of said housing, said flue gas outlet tube extending through said parallel baffle so that flue gas is discharged on the side of said parallel baffle away from the housing, said parallel baffle forming with said one wall of said housing a buffer air passage for air to pass from said combustion air compartment through said relief air openings and up said one side of the housing and create an air curtain inhibiting the hot combustion gases discharged from the flue gas outlet tube from directly contacting said one wall of the housing.

Claim 3

A fuel burning apparatus as defined in claim 1 including a vertical baffle disposed between said parallel baffle and said one wall of the housing, said vertical baffle extending upwardly from the flue gas outlet tube to a top wall of the flue gas cap and dividing the buffer air passage into two adjacent portions each having a relief air opening communicating with the combustion air compartment, so that wind from a direction parallel to said one wall of the furnace may pass horizontally into one section of the buffer air passage, through the relief air opening in the one section, into the combustion air compartment, from the combustion air compartment out through the relief opening in the other section of the buffer air passage, from which it flows along said one wall of the furnace to protect the portion of the wall toward which the flue gases are blown by the wind.

Claim 4

A fuel burning furnace for heating air to be conditioned comprising: A. a housing having walls enclosing a fuel burner and a heat exchanger for passing air to be heated in heat exchange relation with the hot gaseous exhaust of the fuel burner, said heat exchanger having an air heating side and having a combustion side including an inlet end for receiving heated gases from the fuel burner and an outlet end for discharging the hot flue gas therefrom, partition means within the housing forming a combustion compartment and an air heating compartment sealed from the combustion compartment, a flue gas outlet tube communicating with the outlet end of the combustion side of the heat exchanger for receiving the hot flue gases discharged from the combustion side of the heat exchanger, said flue gas outlet tube extending outwardly from a vertical wall of the housing, an air inlet opening communicating with the combustion compartment formed in said vertical wall of the housing for admitting ambient air into the combustion compartment to supply combustion air to the fuel burner, a relief air opening formed in said vertical wall of said housing adjacent the flue gas outlet tube, said relief air opening communicating with the combustion air compartment in the interior of the housing; B. an air inlet cap disposed on said one wall of the housing over said air inlet opening, said air inlet cap comprising baffle means for restricting excessive air flow into the air inlet opening in said housing under various wind conditions; C. a flue gas cap disposed on said one wall of the housing over the projecting end of said flue gas outlet tube and said relief air openings, said flue gas cap comprising a channel shaped member having a top wall, a bottom wall and an end wall disposed parallel with and spaced from said vertical wall of the housing, the sides of said flue gas cap being open, a parallel baffle disposed in a vertical plane parallel to and in spaced relation with said vertical wall of the housing, said flue gas outlet tube extending thrOugh an aperture formed in said parallel baffle so that the flue gas is discharged from the flue gas outlet tube on the side of the parallel baffle away from said vertical wall of the housing, the parallel baffle forming with the end wall of said flue gas cap a horizontally extending flue gas passage spaced from said vertical wall of the housing whereby flue gas from the flue gas tube passes into the flue gas passage and escapes from the open side of the flue gas cap, said parallel baffle forming with said vertical wall of the housing a horizontally extending buffer air passage between the vertical wall of the housing and the horizontal flue gas passage, said relief air opening communicating with the buffer air passage whereby air from the combustion air compartment passes through the relief air opening into said buffer air passage and escapes from the open sides of the flue gas cap adjacent the vertical wall of the housing to create a curtain of air between the flue gas discharged from the flue gas passage and said vertical wall of the housing.

Claim 5

A fuel burning furnace for heating air to be conditioned comprising: A. a housing having walls enclosing a fuel burner and a heat exchanger for passing air to be heated in heat exchange relation with the hot gaseous exhaust of the fuel burner, said heat exchanger having an air heating side and having a combustion side including an inlet end for receiving heated gases from the fuel burner and an outlet end for discharging the hot flue gas therefrom, partition means within the housing forming a combustion compartment and an air heating compartment sealed from the combustion compartment, a flue gas outlet tube communicating with the outlet end of the combustion side of the heat exchanger for receiving the hot flue gases discharged from the combustion side of the heat exchanger, said flue gas outlet tube extending outwardly from a vertical wall of the housing, an air inlet opening communicating with the combustion compartment formed in said vertical wall of the housing for admitting ambient air into the combustion compartment to supply combustion air to the fuel burner, a relief air opening formed in said vertical wall of said housing adjacent the flue gas outlet tube, said relief air opening communicating with the combustion air compartment in the interior of the housing; B. an air inlet cap disposed on said one wall of the housing over said air inlet opening, said air inlet cap comprising baffle means for restricting excessive air flow into the air inlet opening in said housing under various wind conditions; C. a flue gas cap disposed on said one wall of the housing over the projecting end of said flue gas outlet tube and said relief air openings, said flue gas cap comprising a channel shaped member having a top wall, a bottom wall and an end wall disposed parallel with and spaced from said vertical wall of the housing, the sides of said flue gas cap being open, a parallel baffle disposed in a vertical plane parallel to and in spaced relation with said vertical wall of the housing, said flue gas outlet tube extending thrOugh an aperture formed in said parallel baffle so that the flue gas is discharged from the flue gas outlet tube on the side of the parallel baffle away from said vertical wall of the housing, the parallel baffle forming with the end wall of said flue gas cap a horizontally extending flue gas passage spaced from said vertical wall of the housing whereby flue gas from the flue gas tube passes into the flue gas passage and escapes from the open side of the flue gas cap, said parallel baffle forming with said vertical wall of the housing a horizontally extending buffer air passage between the vertical wall of the housing and the horizontal flue gas passage, said relief air opening communicating with the buffer air passage whereby air from the combustion air compartment passes through the relief air opening into said buffer air passage and escapes from the open sides of the flue gas cap adjacent the vertical wall of the housing to create a curtain of air between the flue gas discharged from the flue gas passage and said vertical wall of the housing.

Claim 6

A fuel burning furnace as defined in claim 3 including a vertical baffle disposed between said parallel baffle and said one wall of the housing, said vertical baffle extending upwardly from the upper surface of the flue gas outlet tube to the top wall of the flue gas cap and dividing the buffer air passage into two adjacent portions, each having a relief air opening into the combustion air compartment, so that wind from a direction parallel to said one wall of the furnace may pass horizontally into one section of the buffer air passage, through the relief air opening in the one section, into the combustion air compartment, from the combustion air compartment out through the relief opening in the other section of the buffer air passage, from which it flows upwardly along the one wall of the furnace to protect the portion of the wall toward which the flue gases are blown by the wind.