Heat distribution system for gas-fired ovens

Claim 1

A GAS-FIRED, FORCED AIR CONVECTION OVEN COMPRISING A SUBSTANTIALLY RECTANGULAR OVEN COMPARTMENT BOUNDED BY A PAIR OF SIDE WALLS, TOP AND BOTTOM WALLS, AND A REAR WALL, SAID SIDE WALLS INCLUDING MEANS DEFINING HEAT EXCHANGER CHAMBERS THEREIN EXTENDING SUBSTANTIALLY COEXTENSIVELY WITH THE AREA OF EACH SIDE OF THE OVEN COMPARTMENT BOUNDED BY SIDE PARTITIONS DEFINING THE OVEN COMPARTMENT SIDES, ELONGATED GAS-FIRED BURNER MEANS IN THE LOWER REGIONS OF SAID CHAMBERS EXTENDING SUBSTANTIALLY THE LENGTH THEREOF, HEAT EXCHANGER MEANS IN EACH OF SAID CHAMBERS INCLUDING A LATERALLY ALIGNED SERIES OF ELONGATED VERTICAL HEAT TUBES EXTENDING SUBSTANTIALLY THROUGHOUT THE HEIGHT OF SAID OVEN COMPARTMENT AND DISPOSED AT SPACED LOCATIONS ALONG THE LENGTH OF SAID BURNER MEANS FOR CONVEYING HEAT AND COMBUSTION PRODUCTS FROM SAID BURNER MEANS IN HEAT EXCHANGE RELATION WITH AIR IN SAID CHAMBERS, MEANS DEFINING AN AIR BLOWER CHAMBER IN SAID REAR WALL COMMUNICATING WITH SAID OVEN AND LATERALLY WITH THE REARMOST ENDS OF SAID HEAT EXCHANGER CHAMBERS HAVING DRIVEN AIR BLOWER MEANS FOR WITHDRAWING AIR FROM SAID OVEN AND DISCHARGING THE AIR INTO SAID HEAT EXCHANGER CHAMBERS IN SUBSTANTIALLY UNIFORM VERTICALLY DISTRIBUTED RELATION, AND SAID SIDE PARTITIONS EACH HAVING PERFORATIONS DISTRIBUTED OVER THE AREA OF EACH OVEN COMPARTMENT SIDE AT PLURAL VERTICAL LEVELS SUBSTANTIALLY SPANNING THE HEIGHT OF THE OVEN COMPARTMENT TO ADMIT HEATED AIR THERETO FROM SAID HEAT EXCHANGER COMPARTMENTS.