Patent ID: 8161959

Claim:
A wood burning furnace, comprising: a firebox having a top, a bottom, two opposite sides, a front, and a rear, said top, bottom, sides, front and rear defining a firebox interior, said firebox top having an aperture formed therein, said firebox interior being vertically divided into an upper segment and a lower segment separated by a horizontal grate assembly, said interior upper segment comprising a wood storage compartment and primary combustion chamber, and said interior lower segment comprising a secondary combustion chamber; an air box connected to the firebox top, said air box having a front wall, rear wall, left side wall, a right side wall, a top, and a bottom, said walls, top and bottom defining a hollow air box interior, said air box bottom being attached to the firebox top, said air box having a plurality of apertures formed therein, one of said plurality of apertures being a first aperture formed in the air box rear wall, said first aperture opening into an up draft exhaust pipe terminating into a furnace exhaust flue, another of said plurality of apertures being a second aperture formed in the air box bottom, said second aperture corresponding to the firebox body top aperture providing fluid access from the air box interior into the primary combustion chamber, another of said plurality of apertures being a third aperture formed in the air box front wall, said third aperture being connected to a combustion air blower providing access for forced air from the combustion air blower into the air box interior and subsequently into and through the primary combustion chamber, and into and through the secondary combustion chamber; wherein said air box interior is further comprised of: a first damper operationally adapted to fit over the air box first aperture, said first damper being connected to a first lever pivotally attached outside the air box to the air box right side wall, said first lever being attached to a thermostat; and a second damper operationally adapted to fit over the air box second aperture, said second damper being connected to a second lever pivotally attached outside the air box to the air box right side wall; a manifold chamber connected to a secondary combustion chamber aperture, near to the firebox bottom, opening from the secondary combustion chamber into the manifold chamber which interconnects the secondary combustion chamber with a furnace heat exchanger having an outlet to said furnace exhaust flue, said manifold chamber adapted to receive forced air from said secondary combustion chamber and passing said forced air through said heat exchanger.