Abstract: A fan control system suitable for use in air moving applications has a pressure sensor responsive to an air pressure in an air duct for supplying a static pressure signal representative of the air pressure. A supply air flow sensor is responsive to an air flow in a supply air duct and supplies a supply air flow signal representative of the air flow in the supply air duct. A return air flow sensor is responsive to an air flow in a return air duct and supplies a return air flow signal representative of the air flow in the return air duct. A supply fan moves air in the supply air duct. The supply fan is driven by a supply fan motor. A return fan moves air in the return air duct. The return fan is driven by a return fan motor. A unitary volumetric air flow controller is connected to the supply fan motor and to the return fan motor.

Abstract: An improved roll cover for use on a flat work ironer is provided, having an improved resin coating. The roll cover is a sheet of thermally resistant fabric which is coated or impregnated with a mixture of an acrylic resin and a stiffening agent. The improved roll cover can be dyed to a particular desired color and will retain its color over extended use.

Abstract: A hydraulic rear platform lift for an aircraft loader provides for an increased height by providing a pair of lifting levers actuated by a hydraulic cylinder-piston which extends into cutout space of a forward support frame and mates with the scissor type lifting beams of a forward lifting platform. The lifting mechanism generally consists of a chicken leg lever and tension bar with the actuating force provided by a cylinder--piston connected between the chicken leg lever and the other end of the tension bar. For even greater lifting heights, one end of the tension bar may be placed on the leg of the rear scissor beams with appropriate cutouts being provided in the rear support frame and rear elevatable platform.