Sealed combustion central heating system

Claim 1

THE COMBINATION COMPRISING: A SEALED COMBUSTION CENTRAL HEATING FURNACE; A BUILDING HAVING A PLURALITY OF ROOMS WITH INDIVIDUAL HOT AIR REGISTERS IN EACH ROOM OF SAID PLURALITY AND HAVING AN INLET REGISTER IN A ROOM THEREOF, SAID FURNACE HAVING A ROOM HEATING AIR INLET AND A HEATED AIR OUTLET; FIRST PIPE MEANS COUPLING SAID INLET TO SAID INLET REGISTER; SECOND PIPE MEANS COUPLING SAID OUTLET TO HOT AIR REGISTERS IN VARIOUS ROOMS OF THE BUILDING; BLOWER MEANS DISPOSED BETWEEN SAID INLET AND OUTLET FOR FORCING AIR THROUGH THE REGISTERS AND FOR FORCING THE AIR IN A PATH THROUGH SAID FURNACE; HEAT EXCHANGER MEANS DISPOSED BETWEEN SAID INLET AND OUTLET, SAID HEAT EXCHANGER MEANS HAVING TUBES DISPOSED IN SPACED RELATION TO EACH OTHER AND IN THE SAID AIR PATH BETWEEN SAID INLET AND OUTLET, EACH OF SAID HEAT EXCHANGER TUBES HAVING FRONT AND REAR END MARGINS WITH THE FRONT END MARGIN DISPOSED A SUBSTANTIAL HORIZONTAL DISTANCE FROM THE REAR END MARGIN, AND EACH HEAT EXCHANGER TUBE HAVING SIDE WALLS DISPOSED IN COMPARATIVELY CLOSELY SPACED RELATION, AND EACH TUBE HAVING UPPER AND LOWER MARGINS WITH THE VERTICAL DIMENSION BETWEEN SAID UPPER AND LOWER MARGINS BEING GREATER THAN ANY HORIZONTAL DIMENSION OF THE SAID TUBE, AND EACH TUBE HAVING A COMBUSTION MATERIAL INLET APERTURE IN THE FRONT END MARGIN ADJACENT THE LOWER MARGIN THEREOF AND HAVING A COMBUSTION PRODUCT OUTLET APERTURE IN THE FRONT END MARGIN ADJACENT AN UPPER MARGIN OF THE HEAT EXCHANGER TUBE, SAID HEAT EXCHANGER TUBE INLET APER-TURE AND OUTLET APERTURE BEING DISPOSED IN SUBSTANTIALLY VERTICAL PROJECTION; AN INLET MANIFOLD COMMUNICATING WITH SAID HEAT EXCHANGER TUBE INLET APERTURES AND DISPOSED SUBSTANTIALLY OUT OF THE SAID AIR PATH; AND A COMBUSTION PRODUCT OUTLET MANIFOLD COMMUNICATING WITH THE HEAT EXCHANGER TUBE OUTLET APERTURES AND DISPOSED SUBSTANTIALLY OUT OF THE SAID AIR PATH AND A SUBSTANTIAL VERTICAL DISTANCE ABOVE SAID INLET MANIFOLD; SINGLE PART INSHOT BURNERS EXTENDING GENERALLY HORIZONTALLY IN SAID INLET MANIFOLD, EACH BURNER DISCHARGING INTO ONE OF SAID TUBES ADJACENT THE INLET APERTURE AND DIRECTING FLAME ALONG THE LOWER INNER