Wall-mounted fluid-fuel furnace

Claim 1

A fluid-fired furnace adapted to be mounted on a wall of a structure to be heated, comprising a heater unit including a substantially rectangular heat exchanger firebox having front and rear broad panel walls and relatively narrow peripheral walls defining an upstanding combustion chamber, said firebox being formed by similar front and rear pan-like members having outwardly-turned rims and being secured together in open face to open face relationship to provide an intermediate peripheral fin extending outwardly of such firebox to increase the heat exchange surface area thereof; an elongate fluid fuel burner extending substantially entirely across the lower end of said firebox to direct flames upwardly in Said combustion chamber across the width thereof; conduit means communicating with the interior of the firebox at a low level thereof through the rear panel wall for supplying combustion-supporting air to said burner; conduit means communicating with the interior of the firebox at an upper level thereof for exhausting gaseous products of combustion from the firebox; a housing having walls defining flow channels about the exterior of said firebox for air to be heated and providing for inflow of cool air and outflow of heated air; the lower end of the front panel wall of the firebox and the adjacent bottom peripheral wall portion of the corresponding pan-like member being provided with an access opening leading to the interior of the firebox; a closure plate for said opening provided with a depending flange corresponding to the confronting portion of the rim of the rear pan-like member, the burner being mounted on the inside face of said closure plate; and a fluid fuel supply pipe leading into the firebox from the exterior thereof and connected with said burner, the rim of the rear pan-like member and the flange of the closure plate being recessed for receiving and accommodating said pipe.