Abstract: A sealing assembly for use at a building penetration to seal against airflow and the spread of fire includes a gasket (5) and a retaining plate (6). The gasket seals with a sealing contact against both the penetrating member (3) and the wall surfaces (4) adjacent to the penetration (2). The gasket is resiliently flexible and is positioned in a compressed state to ensure that a seal will be maintained, notwithstanding shifting of the penetrating member with respect to the penetration by frictional slippage between the seal and the adjacent wall surfaces. The compressed state of the gasket is maintained by the retaining plate, which is fastened to the penetrating member.

Abstract: A kit of fire-stop materials contains balanced proportions of sealant and mineral wool. Boxed with tools with a layout that renders transportation and storage convenient, the efficiency of the system makes the package cost effective.