Abstract: A forced air, wall heater includes a heat exchanger which has a plurality of tubes. Each of the tubes include substantially parallel aligned runs and at least one return section between adjacent runs. The return section is aligned generally perpendicular with each of the plurality of runs. The heater also includes a blower positioned for blowing air directly toward the return section to maximize the mass flow rate of air over the return section. At least two of the runs are offset both laterally and in the direction of air flow with respect to each other. The ordering of tubes differs in at least two positions within the exchanger.

Abstract: A furnace utilizing, in the upper portion of its cabinet, a blower acting downward through a separator opening to circulate room air past a combustion chamber whose gases flow upward through a sideward-positioned board radiator member which reaches up to the flue. A substantial increase in efficiency results from drawing the combustion gases out of the combustion chamber at the side opposite to the lower end of the broad radiator member, and interposing therebetween, directly beneath the separator opening, a plurality of tubes which serve as an intermediate heat exchanger. A still greater increase in efficiency is achieved by utilizing, instead, a finned tube heat exchanger across and beneath said separator opening; its heat transfer may be so great as to result in condensation of water vapor in the combustion gas. To purge this, a motorized inducer-blower is used in the inlet air system, driving the condensate through the finned tube heat exchanger to an appropriate drain.

Abstract: A portable electric baseboard heater includes a unitary structural back plate having a central vertical portion bounded by an integral lower triangular closed box-like structure having a downwardly sloping forward surface and an integral upper triangular portion having an upwardly sloping forward surface, a horizontal top surface and a rear vertical wall in the same plane as the central portion and terminating spacedly thereabove to provide a horizontal opening aft of the upwardly sloping forward surface. An angularly bent or molded plastic liner covers the interior of a portion of the top and upwardly sloping surfaces of the upper triangular portion to form an internal thermally insulative handle accessible through the horizontal opening to permit lifting of the heater. The lower triangular portion serves as a protective raceway for power supply wires to an electric finned tube heater assembly supported by the back plate between the upper and lower triangular portions.

Abstract: Apparatus for controlling the idle speed of an internal combustion engine. A contact arm contacts a throttle lever to limit movement of the lever in one direction and to move the lever in the opposite direction so to control the position of a carburetor throttle valve. A vacuum operated unit maintains the contact arm at one position and moves it from one position to another. The vacuum pressure at which the vacuum unit operates is modulated by an electrically operated solenoid to maintain the contact arm in one position when the vacuum pressure is maintained at one level. The contact arm is moved to a new position when the solenoid operates to change the vacuum pressure to a different level.