... duct 1.fiber glass coated aluminum foil 2.Highly flexible 3.Anti-vibration fiberglass fabric flexible duct Specification:Material: glass fabric+ ... °CSpeed of flow: 35 M/SCharacteristic: 1, Use the glass fiber and the high force canvas, use the metal- grips clamps ... aluminum foil,the outer wall was coated with high-quality glass fiber cloth, spiral steel wire support within.Usage: Ventilating, pulls ...