Combustion apparatus and controlled draft inducer

Claim 1

IN A COMBUSTION APPARATUS HAVING A COMBUSTION CHAMBER, MEANS FOR SUPPLYING FUEL TO THE CHAMBER AT A PREDETERMINED RATE OF FLOW PRESELECTED FOR CORRELATION WITH WITH HEAT OUTPUT REQUIRED FROM THE APPARATUS, MEANS FOR SUPPLYING AIR TO THE CHAMBER FOR COMBUSTION THEREIN WITH THE FUEL, AN OUTLET FROM THE CHAMBER FOR COMBUSTION PRODUCTS, AND A FLUE FOR CONVEYING COMBUSTION PRODUCTS TO BE DISPERSED IN THE ATMOSPHERE, THE COMBINATION THEREWITH OF MEANS FOR CONTROLLING THE SUPPLY OF AIR TO THE COMBUSTION CHAMBER TO EFFECT COMBUSTION AND THE AVOIDANCE OF UNDERSIRABLE COMBUSTION BY-PRODUCTS AND COMPRISING: FAN MEANS HAVING AN INLET CONNECTION TO THE COMBUSTION PRODUCTS OUTLET AND AN OUTLET CONNECTED TO THE FLUE FOR POSITIVELY DRAWING COMBUSTION PRODUCTRS FROM THE CHAMBER AND DIRECTING THE SAME UP THE FLUE AND FOR DRAWING AIR INTO THE CHAMBER THROUGH SAID AIR SUPPLY MEANS, AND MEANS FOR LIMITING THE FLOW OF COMBUSTION PRODUCTS FROM THE CHAMBER AND THUS THE FLOW OF AIR DRAWN THEREINTO BY SAID FAN MEANS TO A PREDETERMINED RATE OF FLOW PRESELECTED FOR CORRELATION WITH THE RATE OF FUEL FLOW, SAID MEANS FOR LINITING FLOW COMPRISING A SET OF ORIFICE PLATES, SAID PLATES OF SAID SET HAVING VARIOUS PREDETERMINED OPEN AREAS, EACH PLATE HAVING THE OPEN AREA THEREOF CORRELATED TO A PREDETERMINED RATE OF COMBUSTION PRODUCTS FLOW AND BEING ADAPTED TO BE INDIVIDUALLY SELECTIVELY INTERPOSED BETWEEN SAID FAN MEANS INLET AND THE COMBUSTION PRODUCTS OUTLET, SO THAT CORRELATION OF THE FLOW OF AIR AND FUEL IS OBTAINED.