Air heater or recuperator

Claim 1

AN AIR HEATER AND RECUPERATOR SYSTEM, WHICH COMPRISES IN COMBINATION A HOUSING HAVING AN AIR INLET OPENING FOR ADMITTING AIR TO BE HEATED AND HAVING A DISCHARGE OPENING FOR DISCHARGING HEATED AIR, SAID HOUSING ALSO HAVING DISCHARGE MEANS FOR DISCHARGING HEATING GASES, FIRST WALL MEANS ARRANGED WITHIN THE LOWER PORTION OF SAID HOUSING AND CONFINING A COMBUSTION CHAMBER WITH A BOTTOM WALL PORTION AND A SIDE WALL PORTION AND A TOP WALL PORTION, SAID SIDE WALL PORTION BEING SPACED FROM THE ADJACENT PORTION OF THE HOUSING WALL AND CONFINING THEREWITH AN ANNULAR PASSAGE COMMUNICATING WITH ONE OF SAID OPENINGS, MEANS EXTENDING INTO SAID HEATING CHAMBER FOR PRODUCING HEATING GASES THEREIN, SECOND WALL MEANS ARRANGED ABOVE AND IN SPACED RELATIONSHIP TO SAID TOP WALL PORTION OF SAID HEATING CHAMBER AND CONFINING THEREWITH A FIRST HEAT EXCHANGING CHAMBER COMMUNICATING WITH SAID ANNULAR PASSAGE, A NEST OF HEAT EXCHAGING TUBES ARRANGED IN THE UPPER PORTION OF SAID HOUSING WITH BOTH ENDS OF SAID TUBES OPEN, THIRD WALL MEANS ARRANGED ABOVE AND IN SPACED RELATIONSHIP TO SAID SECOND WALL MEANS AND HAVING ITS MARGINAL PORTION CONNECTED TO SAID HOUSING AND SUPPORTING ONE END OF SAID TUBES, FOURTH WALL MEANS ARRANGED IN SPACED RELATIONSHIP TO SAID THIRD WALL MEANS AND HAVING ITS MARGINAL PORTIONS CONNECTED TO SAID HOUSING AND SUPPORTING THE OTHER END OF SAID TUBES, SAID THIRD AND FOURTH WALL MEANS WITH THE HOUSING WALL PORTION THEREBETWEEN CONFINING A SECOND HEAT EXCHANGING CHAMBER, FIRST CONDUIT MEANS ESTABLISHING COMMUNICATION BETWEEN SAID FIRST AND SECOND HEAT EXCHANGING CHAMBERS, THE WALL OF SAID FIRST CONDUIT MEANS TOGETHER WITH SAID SECOND AND THIRD WALL MEANS AND THE ADJACENT HOUSING PORTION CONFINING AN ANNULAR HEATING GAS RECEIVING CHAMBER COMMUNICATING WITH THE INTERIOR OF SAID TUBES, AND SECOND CONDUIT MEANS FOR CONVEYING HEATING GASES FROM SAID COMBUSTION CHAMBER INTO SAID HEATING GAS RECEIVING CHAMBER.