Abstract: A trickle vent incorporates an automatically controlled movable damper or multiple movable dampers to control the volume of fresh air entering an occupied space of a building through the trickle vent. The trickle vent includes a heating element to condition the fresh air prior to entry into the occupied space. A directional grille is provided to initiate circulation within the occupied space.

Abstract: A fan assisted floor ventilation diffuser includes an enclosed diffuser housing with an air inlet opening and an air outlet opening. A diffuser grille covers the air outlet opening and an inlet fan is mounted at the air inlet opening. The inlet fan pulls air from the underfloor plenum into the floor ventilation diffuser housing and discharges the air through the diffuser grille into the occupied space. A thermostat in each room of the occupied space above the floor controls the operation of the inlet fan for each floor ventilation diffuser in the room and thereby controls the amount of air passing through the floor ventilation diffuser and into an individual room in the occupied space.

Abstract: A variable air volume ceiling diffuser includes a damper that is raised and lowered by a linkage that is controlled by a duct temperature sensor/actuator and one or more room temperature sensors/actuators. The linkage includes a heating slide movable for the heating mode and a cooling slide movable for the cooling mode. The duct temperature sensor/actuator selects the heating slide for movement by the room temperature sensors/actuators in the heating mode and selects the cooling slide for movement by the room temperature sensors/actuators in the cooling mode. The differential movement between the heating and cooling slides moves a roller that engages a profiled cam surface attached to two lever arms. As the roller moves along the cam surface, the lever arms pivot about their axis of rotation so that the damper moves upward to close the air inlet and downward to open the air inlet.

Abstract: A modular floor terminal mounted in the floor of an occupied space for delivering air from an underfloor air plenum to the occupied space. The modular floor terminal includes a square or rectangular housing with an air inlet at the bottom and an air outlet at the top. A rotating damper is positioned in the housing between the air inlet and the air outlet. The position of the damper is controlled by an actuator which is in turn controlled by a thermostat/controller in the occupied space above the floor.