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UL Systems

Penetrations | UpCodes

July 30, by. There are two types of penetrations to be considered. A through penetration has an opening that passes entirely through a fire-resistance rated assembly, while a membrane penetration has an opening that only passes through one side of the assembly. For example, a recessed electrical box mounted in a gypsum board wall surface of a fire-resistance rated wall, with conductors in the wall cavity is a membrane penetration. This article focuses on products UL certifies for protecting membrane penetrations in these walls.

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Section 714 Penetrations

Click on any link below to view the UL ratings. All have been tested to UL standards. Some of our systems also have T and L Ratings.

Through penetrations of fire-resistance -rated walls shall comply with Section Exception: Where the penetrating items are steel, ferrous or copper pipes, tubes or conduits, the annular space between the penetrating item and the fire-resistance -rated wall is permitted to be protected by either of the following measures:. Through penetrations of horizontal assemblies shall comply with Section Through penetrations shall be protected by an approved through-penetration firestop system installed and tested in accordance with ASTM E or UL , with a minimum positive pressure differential of 0.