Abstract: A furnace of the type for supplying circulating heated air to an comfort space, the furnace being contained within a cabinet, having a door allowing access to the interior thereof, which is set in a door frame, wherein the furnace is capable of operating in at least any vertical orientation, an improvement comprising. The bottom end of the door is removably retained against a bottom portion of the door frame, via a hinge, when the furnace is any vertical orientation. At least one latch is located adjacent the top end of the door when the furnace is in any vertical orientation, the latch being constructed to engage a mated door strike; and at least one door strike is located in both a top portion and a bottom portion of the door frame.

Abstract: In a furnace of the type having a blower shelf with a blower attached to one surface thereof and a heat exchanger unit located proximate a second surface thereof, and the heat exchanger unit being reversibly attachable to the blower shelf, the improvement comprising: a retaining structure unitary with the back panel of the heat exchanger; and a structure which mates with the retaining structure and is unitary with the blower shelf. The retaining structure and mating structure function jointly to retain the back panel of the heat exchanger unit perpendicular to and proximate the blower shelf.

Abstract: A cell panel for a gas furnace having a burner box containing combustion burners includes burner target plates formed by an extrusion process from the sheet material forming the cell panel. The burner target plates include a concave side positioned to face the discharge side of a corresponding burner, and a convex side upon which the flared inlet port of a corresponding heat exchanger cell may be securely seated.

Abstract: A furnace for supplying circulated heated air to a comfort zone, the furnace having a condensing heat exchanger and a blower for moving ambient air over the heat exchanger, wherein a transformer for stepping down line voltage (115 VAC) to control voltage (24 VAC) is secured to the inner surface of an enclosed housing within the furnace wherein the inner wall also supports at least one retaining bracket and one fastenable support bracket. A first flange extending from the transformer engages the retaining bracket to rotatably support the transformer. A second flange extending from the transformer engages the fastenable support bracket to secure and further support the transformer supported within the housing. A threaded member secures the fastenable support bracket to the second flange, thereby preventing disengagement.