Patent ID: 8210844

Claim:
An air impingement conveyor oven comprising: (a) a baking case having an interior space bordered by opposing longitudinal walls, opposing lateral walls, a ceiling, and a floor; (b) an air plenum partitioning the baking case's interior space into an air impingement space and an air return space, the air plenum having at least a first intake port opening at the air return space, the air plenum further having a plurality of air impingement ducts extending into and opening at the air impingement space; (c) a first passive air flow conduit opening the baking case, the first passive air flow conduit having an output end positioned at the return air space; (d) combustible fuel injection and ignition means connected operatively to the first passive air flow conduit; and (e) air impelling means mounted operatively within the baking case for drawing impingement air from the air impingement space into the air return space, for drawing outside combustion air through the first passive air flow conduit into the air return space, and for driving said air through the air plenum's at least first intake port into the air plenum.