Air heater

Claim 1

AN AIR HEATER COMPRISING A HOUSING; AN AIR HEATING CHAMBER WITHIN SAID HOUSING ADAPTED FOR PASSING AIR THERETHROUGH; A FURNACE SYSTEM DEFINED BY A WALLED CONDUIT EXTENDING THROUGH SAID AIR HEATING CHAMBER IN HEAT EXCHANGE THEREWITH, SAID FURNACE SYSTEM INCLUDING A COMBUSTION CHAMBER HAVING WALL MEANS IN HEAT EXCHANGE WITH THE AIR HEATING CHAMBER, BURNER MEANS FOR BURNING FUEL IN SAID COMBUSTION CHAMBER IN THE PRESENCE OF AIR, AIR INTAKE MEANS FOR DRAWING AIR INTO SAID BURNER MEANS, OUTLET MEANS FOR DISCHARGING COMBUSTION GASES FROM SAID COMBUSTION CHAMBER, SEPARATE CONDUIT MEANS COMMUNICATING WITH SAID AIR INTAKE AND OUTLET MEANS, PROJECTING THROUGH A WALL OF SAID HOUSING AND ADAPTED FOR INSTALLATION THROUGH A WALL STRUCTURE FOR COMMUNICATING WITH AIR ON THE OTHER SIDE OF SUCH WALL STRUCTURE, EACH OF SAID CONDUIT MEANS COMPRISING, A PLURALITY OF TUBULAR CONDUIT MEMBERS OF DIFFERENT DIAMETERS POSITIONED ONE WITHIN THE OTHER IN SPACED-APART RELATION, AND MEANS FOR HOLDING SAID CONDUIT MEMBERS IN SPACED-APART RELATION INCLUDING A PAIR OF RODS AT APPROXIMATELY RIGHT ANGLES TO EACH OTHER AND EACH EXTENDING DIAMETRICALLY OF AND LOOSELY THROUGH OPENINGS IN THE WALLS OF THE TUBULAR MEMBERS, THE RODS BEING OF A LENGTH TO HAVE THE ROD ENDS EXTENDING BEYOND THE OUTER PERIMETER OF THE OUTERMOST TUBULAR MEMBER WHEREBY THE ANGULAR RELATION OF THE RODS HOLDS THE TUBULAR MEMBERS IN ASSOCIATED RELATION AND THE RODS CAN BE MANIPULATED EXTERNALLY OF THE CONDUIT, AND MEANS ON THE RODS ENGAGEABLE WITH THE OUTERMOST TUBULAR MEMBER FOR HOLDING THE RODS IN POSITION.