Clean air work stations, i.e. selected areas within a space which filtered air is passed

Full Title

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 (room units F24F1/00) > characterised by the treatment of the air otherwise than by heating and cooling > by purification, e.g. by filtering; by sterilisation; by ozonisation > Clean air work stations, i.e. selected areas within a space which filtered air is passed