Gas-fired furnace

Claim 1

IN A GAS-FIRED FURNACE COMPRISING CABINET MEANS HAVING AN AIR INLET AND AN AIR OUTLET AND BLOWER MEANS FOR MOVING AIR THROUGH THE CABINET MEANS, AND UPRIGHT VESTIBULE PANEL DISPOSED IN THE CABINET MEANS, THE VESTIBULE PANEL HAVING A FLUE OPENING THERETRHOUGH AND A BURNER OPENING FOR RECEIVING BURNER MEANS, A HEAT EXCHANGER DISPOSED IN THE AIR FLOW PATH THROUGH SAID CABINET MEANS, BURNER MEANS ASSOCIATED WITH SAID HEAT EXCHANGER FOR SUPPLYING HEATED GAS THERETO AND FLUE MEANS ASSOCIATED WITH SAID HEAT EXCHANGER FOR RECEIVING HEATED GAS AND PASSING SAME FROM SAID CABINET MEANS, THE IMPROVEMENT COMPRISING SAID HEAT EXCHANGER BEING CONSTRUCTED FROM A BURNER TUBE OF RELATIVELY LARGE CROSS-SECTIONAL AREA AND A PLURALITY OF SMALLER TUBES OF RELATIVELY SMALL CROSSSECTIONAL AREA, THE SMALLER TUBES BEING SECURED AT THEIR ENDS TO FRONT AND REAR BREECHINGS, THE FRONT BREECHING HAVING A FLUE OUTLET, THE FRONT BREECHING BEING SECURED TO THE VESTIBULE PANEL WITH THE FLUE OUTLET IN THE BREECHING BEING ALIGNED WITH THE FLUE OPENING IN THE VESTIBULE PANEL, THE AXES OF SAID SMALLER TUBES BEING DISPOSED GENERALLY PARALLEL TO ONE ANOTHER AND TO THE AXIS OF THE BURNER TUBE, SAID BURNER TUBE BEING CENTRALLY ORIENTED AND SAID SMALLER TUBES BEING DISPOSED ABOUT SAID BURNER TUBE, SAID BURNER TUBE BEING CONNECTED TO SAID REAR BREECHING AND EXTENDING THROUGH A CENTRAL OPENING IN SAID FRONT BREECHING AND BEING ADAPTED TO RECEIVE HEATED GAS FROM SAID BURNER MEANS, THE GAS PASSING THROUGH THE BURNER TUBE TO THE REAR BREECHING AND BACK TO THE FRONT BREECHING WHICH COMMUNICATES WITH THE FLUE MEANS FOR DISCHARGING GAS FROM THE CABINET MEANS, WITH AIR PASSING OVER THE HEAT EXCHANGER BEING IN HEAT EXCHANGE RELATIONSHIP WITH THE BURNER TUBE, THE SMALLER TUBES, AND THE BREECHINGS, THE AXES OF THE BURNER TUBE AND THE SMALLER TUBES BEING GENERALLY AT RIGHT ANGLES TO THE PLANE OF THE VESTIBULE PANEL, SAID REAR BREECHING BEING CONNECTED TO SAID FRONT BREECHING ONLY BY SAID SMALLER TUBES AND BEING FREE TO EXPAND AND CONTRACT LONGITUDINALLY OF THE SMALLER TUBES.