Wall sleeve for feeding an installation pipe through a wall, has intumescent sealing material which is arranged around the installation pipe, in the initial state in the shape of strips

摘要

An intumescent sealing material (6) is arranged around the installation pipe (4), in the initial state in the shape of strips (7) with air space (8). The volume of the air space corresponds to the product of starting volume and the expansion factor. The sealing material is arranged between the wall sleeve (1) and installation pipe.