... low and medium pressure heating, cooling, ventilation, exhaust and air conditioning systems.Airtight aluminium flexible ducts ... high requietment of the enviroment area, such as hospital, laboratory, howff, bus, train, broadcasting studio.PROPERTIESVALUEDiameter Range75-750mm ... medium pressure heating, cooling, ventilation, air conditioning, exhaust and dust extraction systems.Cloth based pvc flexible ...