Heat saver device

Claim 1

A heat exchange device for extracting waste heat from furnace exhaust gases and transferring the heat to a stream of ambient air providing a source of additional heat, and comprising: a hollow casing enclosed at opposite ends by a pair of identically shaped end connectors, each of which includes an aperture formed therethrough; said hollow casing further including a plurality of side walls with one side wall having a pair of spaced apertures extending therethrough, with said casing also including a further side wall having an aperture formed therethrough; a pair of spaced manifold plates extending through said hollow casing and including a plurality of corresponding apertures formed through both said manifold plates; each of said side walls further includes opposite end portions having a substantially S-shaped configuration, wherein a portion of one of said end connectors and a portion of one of said manifold plates are each inserted into a pair of separate channels formed in one of said S-shaped end portions, with a plurality of spaced attachment means releasably fastening both said and connector and said manifold plate to said respective S-shaped end portion; a plurality of separate tubular conduits extending through said casing, with each conduit passing through a corresponding pair of apertures formed in said manifold plates; said tubular conduits forming a plurality of separate, staggered rows each extending across said hollow casing, wherein each of the tubular conduits in one row intrudes between a pair of adjacent tubular conduits positioned in an adjacent row to increase the time it takes the ambient air stream to travel through said hollow casing; a fan assembly positioned adjacent said casing including a tubular passageway surrounding at least one of said two apertures formed through said one side wall; and temperature sensing means attached to said casing for actuating said fan assembly only when the ambient air within said casing exceeds a predetermined temperature.