Aluminium Ducting, Flexible ventilation ducting is very flexible, hard-wearing, multi-ply aluminium foil. Puncture resistant. 100mm, 125mm, 150mm, 200mm, 250mm & 315mm dia sizes available. -30 to 140 Deg C operating temperature range. Available in 5m & 10m lengths. Manufactured to EU standard: EN13180. Fire resistant to BS 476. This is an important Building Regulation requirement as it reduces the risk of fire spreading through the duct to different rooms.