Abstract: The present provides a condensing heat exchanger assembly that includes a plurality of heat exchanger passes. The condensing furnace includes a burner assembly having a combustion air device and further includes a frame having primary heat exchanger with a first pass and a second pass. A secondary heat exchanger having a third pass and a fourth pass. The primary heat exchanger assembly may be generally parallel to the secondary heat exchanger assembly such that supply airflow may traverse over the primary and secondary heat exchangers simultaneously in both a first direction and in an opposite second direction. The first pass may include a single drum. The second pass, third pass and fourth pass may include a plurality of aligned tubes.

Abstract: A fireplace heat exchanger which may be used in conjunction with a fireplace screen, such as a glass screen. The heat exchanger comprises a lower header fed by a blower drawing in room air and delivering this air to a plurality of C-shaped tubes in the fireplace capable of supporting logs. These tubes deliver the air to an upper header, from which the air is fed downwardly by a central C-shaped tube to a room delivery chamber below the lower header. The delivery chamber is part of a lower support on which a glass or other fireplace screen may be placed. The air is heated during both its upward and downward travel and is delivered at floor level.