1)Temperature rang: -30c --+250c 2)Velocity of air flow (max) 30m/s 3)Working pressure 2500pa 4)Bending radius 0.54*d Alum flexible ducts are specifically produced for low and medium pressure hearting, cooling, ventilation, exhaust and air conditioning systems Air tight alum flexible ducts are produced from multi layers alum strengthened with high tension hard steel spring wire, it has high ...