Abstract: An open space office system comprises a plurality of freestanding work stations (10) constructed of vertical panels (14) and horizontal work surfaces (12). The room in which the work stations (10) are arranged are provided with a central ventilation means (41) which provides air circulation in the room. Each work station (10) includes at least one common conduit (26) arranged adjacent the work surface (12) thereof. A vent (35) disposed in each of the work stations (10) communicates with the conduit (26) thereby providing an air flow path from the central ventilation system (41) through the room to the conduit (26). In this way, return air of the ventilation system is evacuated from the room by means of the conduits (26). The conduits (26) are typically connected to a central return air duct (42).