Abstract: A bi-directional airflow controllable system for controlling flow of air through an air circulating system to at least one zone an air temperature of which is to be controlled is coupled to an airflow duct to aid or oppose airflow throughout the duct and the system to the zone. The bi-directional airflow controllable system includes a fan positioned to interact with air moving through the system and the duct. The fan is coupled to a motor to be energized to drive the fan in a forward or reverse direction. The fan when driven by the energized motor in a forward direction creates air pressure from the fan to oppose the flow of air from the airflow duct. The fan when driven by the energized motor in a reverse direction aids the flow of air from the airflow duct. A bi-directional airflow control unit is electrically coupled to the motor.

Abstract: The invention is directed to a method and apparatus for controlling airflow in a given direction in an air circulating system in which the method comprises the steps of:(a) placing a motor driven fan in the air circulating system in such a manner that the fan, when driven by the motor, creates pressure in a direction opposing the given direction of airflow, and(b) activating the motor to drive the fan to cause the airflow moving in said given direction to be diminished because of said opposing pressure.The apparatus is directed to an air flow controllable register for controlling a flow of air through the register from a register air flow supply duct in response to an externally provided control signal that commands differing airflow rates through the register. More specifically, the air flow controllable register includes a register flow control unit that includes a rotary mounted fan positioned within the register airflow supply duct. The fan is coupled to a motor.

Abstract: Operational efficiency in a combined engine starting and power generating system including an engine 110 connected to a dynamoelectric machine 142 useable as a motor or as a generator via a differential 114 and utilizing variable and fixed displacement hydraulic units 146, 156 is increased by sizing the variable and fixed hydraulic units 146 and 156 for power generating operation and by providing an auxiliary fixed displacement hydraulic unit 162 for use only during an engine starting mode.