Abstract: Each of a pair of heat exchangers, such as a radiator and a condenser, includes a tubular structure defining a fluid flow path between an inlet manifold and an outlet manifold. The heat exchangers reside in juxtaposition for a unit with the respective fluid flow paths being congruently aligned along the axis of a stream of cooling medium passing therethrough. The heat exchangers are sealingly encased within a shroud for directing the stream of cooling medium through the tubular structures. The shroud, which is alternately usable with a conventional radiator, and the heat exchanger units are installed in a motor vehicle as a pre-fabricated modular cooling unit.

Abstract: A remote control system for bidirectionally rotating an electric motor, such as for opening and closing a blind or the like, comprises a hand-held transmitter including a transmitting circuit capable of developing a forward rotation command signal and a reverse rotation command signal, and a transmitter responsive to each of the command signals for producing a corresponding, predetermined number of infrared pulses for a predetermined amount of time. A receiver and drive unit is operatively coupled with the motor and comprises a receiver responsive to the infrared pulses for developing a corresponding received command signal, a discriminator circuit for determining whether the received command signal corresponds to the command signal for normal rotation or reverse rotation and for producing a corresponding forward rotation or reverse rotation control signal, and a drive circuit responsive to the control signal for causing rotation of the electric motor in the corresponding direction.