... pressure heating, cooling, ventilation, exhaust and air conditioning systems.Airtight aluminium flexible ducts are produced from ... laboratory, howff, bus, train, broadcasting studio.PROPERTIESVALUEDiameter Range75-750mm (3"-30")Temperature Range-30 ~ +250ºCVelocity Of Air Flow ... pressure heating, cooling, ventilation, air conditioning, exhaust and dust extraction systems. Cloth based pvc flexible duct ...