| 摘要 |
The installation component has a unilaterally closed molded casing (1) that is made of a resiliently deformable intumescent polyurethane foam and comprised with an opening (3) whose cross section is equivalent to 60% of the cross section of breakthrough in wall or ceiling. The molded casing is formed as a single component with a base surface having a flange (2) which is protruded in a radially outward direction. |
