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Webasto and Eberspacher Heater 90mm Warm Air APK Ducting Please Note: All combination orders will be supplied as a single complete uncut length. Order 3 x 1 metre lengths and receive 1 x 3 metre length. High quality 90mm internal diameter flexible APK ducting, for professional use High Quality APK ducting for boat, RV motorhome installations Available in cut to order lengths - 1 metre multiples Approved for Eberspacher Heaters Approved for Webasto Heaters Can be shaped by hand to a minimum internal radius of 3 x diameter (270mm) 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) Maximum uncut length from stock is 20 metres.