Abstract: A variable-air-volume (VAV) conditioning system having at least one diffuser (27a-27d) for discharging supply air (SA) into a room (22a-22d) a flow control element (53) movably mounted in the diffuser for control of the volume of supply air (SA) discharged from the diffuser (27a-27d) in response to thermal loading in the room (22a-22d). The VAV system also includes a ventilation air source (41), independent of the supply air source (23), which is fluid coupled to a ventilation air opening defining structure (59), such as a nozzle, located in the diffuser housing (15) at a position downstream of the flow control element (53).

Abstract: A variable-air-volume (VAV) conditioning system having at least one diffuser (27a-27d), a flow control element (53) movably mounted for control of the volume of supply air (SA) discharged from the diffuser (27a-27d). The VAV system also includes an air induction nozzle (50,58) mounted to induce room air (RA) flow over a room air temperature sensor (28a, 28a') which controls movement of the flow control element (53). The induction air nozzle (50,58), however, is fluid coupled to a ventilation air assembly for the discharge of ventilation air (VA) into the rooms (22a-22d). Preferably, the induction air assembly is provided by a ventilation conduit assembly (44, 46a-46d) and a ventilation air treatment and supply assembly (41) fluid coupled to a ventilation air source. The ventilation air is discharged through the air induction nozzles (58).