F24F 2003/1452

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 characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification {by dehumidification only by condensing heat extracted from the humid air for condensing is returned to the dried air}