Abstract: An air flow controller has an adjustable air flow passageway and comprises a surface-mounted distribution frame housing one or more elongate passages. Each passage has an inlet, a flow channel and an outlet. The inlet has two opposed guide flaps to control the flow of air passing into the flow channel. Two opposed wall members define the width of the channel, the wall members being adapted to be position-adjusted on control movement of the guide flaps with the outer ends of the wall members defining the outlet.

Abstract: A battery charger includes a first charger for providing a first battery charging current and a second charger for providing a second battery charging current. A switch is provided for manually actuating the second charger. A timer times the second charger cycle. The timer is used to initiate the discontinuation of operation of the second charger. When the second charger is operating, the timer is inhibited from being reset. When the first charger discontinues supplying a charging current, the battery charger is conditioned to again permit actuation of the switch to reset the timer and allow operation of the second charger.