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Diesel Heater 40mm Internal Diameter Warm Air Ducting Diesel heater warm air heater ducting with 40mm internal diameter cut to order up to 20 metres. Please Note: all combination orders will be supplied as a SINGLE UNCUT length. Order 3 x 1 metre lengths and receive 1 x 3 metre length. Up to 20 metres. High Quality APK ducting for boat, RV motorhome installations Available in cut to order lengths 1 metre multiples Can be shaped by hand to a minimum internal radius of 3 x diameter High quality 40mm internal diameter flexible APK ducting, for professional use. APK material for ducting is an industry standard. A - Inner layer - Aluminium heat reflective P - Centre layer - Paper (flexible cardboard) K - Outer layer - Plastic (Kunststoff)