Automatic oven air balancing system

Claim 1

AN OVEN COMPRISING WALLS DEFINING A WORK-RECEIVING CHAMBER, A HEAT SOURCE, AN ADJUSTABLE FRESH AIR INTAKE FOR SAID HEAT SOURCE, MEANS FOR FLOWING HEATED AIR FROM SAID HEAT SOURCE UPWARDLY THROUGH SAID WORK-RECEIVING CHAMBER, ADJUSTABLE VENT MEANS FOR EXHAUSTING AIR FROM THE CHAMBER, COLLECTOR DUCT MEANS IN AN UPPER PORTION OF SAID CHAMBER AND OPEN AT THE BOTTOM FOR ENTRY OF AIR THEREINTO, SAID DUCT MEANS AT ONE END COMMUNICATING WITH SAID HEAT SOURCE AND AT ITS OTHER END WITH SAID VENT MEANS, REGULATING MEANS FOR ADJUSTING SAID FRESH AIR INTAKE AND SAID VENT MEANS TO ESTABLISH DIFFERENT EXHAUST SETTINGS FOR THE CHAMBER, BARRIER MEANS TRANSVERSELY WITHIN THE DUCT MEANS INTERMEDIATE THE ENDS THEREOF, SAID BARRIER MEANS FORMING A TRANSVERSE PARTITION IN THE DUCT MEANS TO DIVIDE THE FLOW OF AIR ENTERING THE SAME BETWEEN THE HEAT SOURCE FOR RECIRCULATION AND THE VENT MEANS FOR EXHAUST, BARRIER-ADJUSTING MEANS FOR VARYING THE EFFECTIVE LONGITUDINAL POSITION FORMED BY THE BARRIER MEANS IN THE DUCT MEANS, THEREBY TO PROVIDE DIFFERENT DEGREES OF RECIRCULATION AND EXHAUST OF THE SAID HEATED AIR WHICH ENTERS THE DUCT MEANS, AND CONTROL MEANS FOR OPERATING SAID BARRIER-ADJUSTING MEANS TO INCREASE THE AMOUNT OF AIR PROCEEDING FROM THE DUCT MEANS TO THE VENT MEANS WITH INCREASE IN THE COMBUSTIBLE MIXTURE IN THE EXHAUST OF THE CHAMBER.