with separate supply lines and common return line for hot and cold heat-exchange fluids

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 arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units > with separate supply lines and common return line for hot and cold heat-exchange fluids