Through-penetration firestop systems are designed to restore the hourly rating of fire resistive-assemblies that have been breached due to penetration by electrical, plumbing or mechanical items.
Said items are vital in modern building construction, which often times requires them to pass through fire-resistive floor or wall assemblies.
To maintain the fire-resistant properties, large openings are cut through the wall or floor, and the penetrating items are installed, leaving an annular space around them.
Various types of fire-resistant materials are then installed within that open space, around the penetrants, to prevent flames and hot gases from passing through.
All of AFI’s applications are tested UL Systems and Engineering Judgements.