Fuel burning hot air heater

Claim 1

A FUEL BURNING HOT AIR HEATER COMPRISING AN ELONGATED CASING HAVING AN INLET OPENING AT ONE END FOR THE ADMISSION OF FRESH AIR AND AN OUTLET OPENING AT ITS OPPOSITE END FOR THE DELIVERY OF HEATED AIR, A COMBUSTION CHAMBER WITHIN SAID CASING, MEANS FORMING AN AIR PRE-HEATING CHAMBER EXTERNALLY OF SAID CASING IN THE REGION OPPOSITE SAID COMBUSTION CHAMBER, SAID AIR PRE-HEATING CHAMBER HAVING A FIRST CONDUIT FOR THE ADMISSION OF AIR ADJACENT SAID OPPOSITE END OF SAID CASING, MEANS INCLUDING A SECOND CONDUIT FOR CONNECTING THE INTERIOR OF SAID COMBUSTION CHAMBER TO THE INTERIOR OF SAID AIR CHAMBER, A HEAT EXCHANGER WITHIN SAID CASING ADJACENT THE OUTLET END THEREOF, MEANS CONNECTING THE OUTLET END OF SAID COMBUSTION CHAMBER TO THE INTERIOR OF SAID HEAT EXCHANGER, MEANS INCLUDING A THIRD CONDUIT EXTENDING THROUGH SAID AIR CHAMBER AND IN HEAT EXCHANGE RELATION WITH SAID FIRST CONDUIT CONNECTING THE OUTLET END OF SAID HEAT EXCHANGER TO THE EXTERIOR OF SAID CASING, THE OUTER TERMINAL PORTIONS OF SAID FIRST AND THIRD CONDUITS BEING JUXTAPOSED, AND A PAIR OF MOTOR DRIVEN BLOWERS POSITIONED ADJACENT THE INLET END OF SAID CASING AND THE INLET END OF SAID COMBUSTION CHAMBER, RESPECTIVELY, TO CAUSE AIR TO MOVE SEPARATELY THROUGH SAID CASING AND SAID COMBUSTION CHAMBER.