Heat exchanger for a log-burning fireplace

A heat recovery apparatus for an indoor fireplace comprising:

• a) a plenum chamber comprised of:
• 1) flat upper and lower panels in spaced apart horizontal orientation, each bounded by straight front and rear edges, and opposed side edges extending between said front and rear edges in joinder therewith,
• 2) vertically oriented side and rear boundary walls extending between said panels in joinder with said side and rear edges, respectively, thereby defining an open front extremity of said chamber, and a vertical plane of symmetry centered between said side edges, and
• 3) a divider wall extending vertically between said upper and lower panels upon said plane of symmetry and serving to define inlet and outlet portions of said plenum chamber, said divider wall having a length reaching from said open front extremity to a distal end located between 70% and 75% of the distance between said open front extremity and said rear boundary wall, causing the space between said distal end and rear boundary wall to be an air passageway,
• b) a forward compartment associated with said inlet portion at said open front extremity and extending between said divider wall and a side boundary wall, and
• c) electrically operated air forwarding means interactive with said forward compartment, whereby
• d) air driven by said air forwarding means is caused to enter said inlet portion, pass through said passageway and outlet portion, and exit said plenum chamber through the open front extremity of said outlet portion, wherein said heat recovery apparatus is fabricated by the welding of steel plate components and wherein said upper and lower panels are spaced apart by 1 to 3 inches in parallel relationship, causing said plenum chamber to have a generally trapezoidal shape.