**Silver Aluminium Air Ducting 5m [150mm]** Silver ducting made from aluminium, comes in a variety of diameters and is easy to cut. We have 5m lengths of silver duct available on our online store and often have 10m boxes in store. Silver Ducting Features: highly flexible made from aluminium reflective Use aluminium tape or duct clamps to join the silver ducting to fans and carbon filters.