Answer: it is stainless steel tubing reinforced with a layer of compressed rock wool insulation, the external temperature of which does not exceed 30 ° C.
Double wall casing is a recent technology which benefits from integrated insulation. The double wall casing is made of stainless steel to avoid corrosion problems, and incorporates a layer of compressed rock wool insulation which provides a connection without thermal bridge. While single wall casing can reach 150 ° C, double wall casing has an external temperature which never exceeds 30 ° C. It is sold in two forms: the flexible form intended for casing a conduit masonry, and the rigid form which can be used for casing a vertical duct or replace the duct itself. It is therefore a very advantageous system, which, moreover, is quickly and inexpensively assembled. A good deal ! You too, send us your brico question