Patent ID: 8893703

Claim:
A biomass combustion chamber comprising; an upper combustion chamber; a lower combustion chamber, wherein the lower combustion chamber includes a grate for supporting a fuel bed, said fuel bed for accepting a solid fuel, a plurality of air flow apertures for allowing oxygen into the combustion chamber, wherein the apertures are substantially shielded from the direct line of site of the fuel bed, and the cross-section of the upper combustion chamber is less than the cross section of the lower combustion chamber; and a slab and a slab cap, wherein the slab cap further comprises a lip and flange for aiding in shielding the apertures from direct view of fuel positioned in the fuel bed, wherein the upper combustion chamber and lower combustion chambers are separably engaged at a respective lower rim and upper rim; and the upper combustion chamber further defining a cone shaped funnel structure in direct line of site of the fuel bed.