of air inlet chambers as hereinafter described in the assembly illustrated in fig1 the scroll panels 11 12 are maintained parallel to each other by a scroll shaped wall 18 to which the panels 11 12 are secured by conventional fasteners not shown this scroll shaped wall 18 rises vertically from a left outlet edge 19 and curves at a radius which becomes progressively smaller to the right as shown and then downward and back partly to the left to a reverse curved right outlet edge 20 also coincident with the lower extremities of the scroll panels 11 12 the space in the horizontal plane between the left outlet edge 19 and the right outlet edge 20 serves as the blower outlet 21 inlets to the blower scroll assembly 10 are provided by circular openings 23 24 into the forward and rear scroll panels 11 12 respectively the centers of these openings 23 24 are the centers about which the varying curvature scroll wall 18 is curved each of the openings 23 24 is fitted with a conventional stream flow inlet baffle 25 within the forward opening 23 a blower motor 28 is mounted between the forward and rear panel circular openings 23 24 is a conventional centrifugal blower wheel 26 whose supporting disk 27 is mounted on the shaft of the blower motor 28 an electrical connector leads from the motor 28 to a socket 29 mounted in the forward extending part 13 fig2 illustrates a heating unit assembly likewise made up prior to the assembly of the furnace a heater control panel generally designated 30 is to be oriented vertically beneath the forward scroll panel 11 its width is equal to.