F24F 2003/006

Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems {with primary air treatment in the central station and subsequent secondary air treatment in air treatment units located in or near the rooms with two air ducts for separately transporting treated hot and cold primary air from the central station to air treatment units located in or near the rooms}