Supplemental heating system

Claim 1

A supplemental heating system for installation in a furnace flue which includes a flue pipe and a chimney, connecting the furnace to the atmosphere, said system comprising an inner pipe section, arranged to be connected in the flue, a sleeve having a diameter appreciably larger than that of the pipe section and positioned concentric therewith, closure means connected between the ends of the sleeve and the wall of the pipe section for defining with the section and the sleeve an annular space; means defining a first opening in the sleeve; a blower mounted to the sleeve, said blower having its outlet communicating with said first opening such that air can be forced into said first opening in a direction substantially normal to the wall of the sleeve; one or more additional openings in the sleeve being circumferentially positioned from said first opening; a baffle connected between the outer wall of the pipe section and the inner wall of the sleeve and being circumferentially positioned approximately midway between said first opening and said one or more additional openings in said sleeve, said baffle extending longitudinally along said pipe section and substantially abutting said closure means whereby when the system is connected in said flue pipe between the furnace and the flue and the furnace is turned on, the hot products of combustion therefrom pass through the inner pipe section thereby heating it so that when the blower is turned on, the air discharged thereby into said annular space is forced in one direction around the outer surface of the inner pipe section thereby to heat the air as it is discharged through said additional openings.