Sliding ducts (or telescope fittings) allow to adjust the length of standard tubes and to bridge eventual gaps.
They are also useful when straight ducts with parallel flanges have to be shortened on the building site.
Product Specifications for Tender Texts
Sliding Pipes / Sliding Ducts. Liquid and oil-tight laser-welded METU-FORM sliding pipes (serve as duct-length adjustments) made of galvanized steel or stainless steel (V2A / 1,4301 / 304) with a formed-on "parallel" flange on one end. Diameters from 80 up to 1000 mm. Connection with SRX joining clips. The air-tightness exceeds the highest-class D according to the norm DIN EN 12237. Tightness class ATC 1 (EN 16798-3). No ATEX / EX certifications.