| 摘要 |
A fire resistant assembly which may be used to ensure the fire resistance of a fire barrier such as a wall, comprising a first layer having a lumen therein, a second layer adjacent the first layer, and a box having a cavity defined by a wall, an opening in the wall, and a flange proximate the opening, wherein the box is disposed betwee n the first layer and the second layer and wherein the opening is disposed on the lumen of the first layer. |
