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The 3M 7000059408 is a pair of triple mounting brackets designed for use with three 4-inch square 3M Fire Barrier Pass-Through Devices arranged in a 1 x 3 array. These 4 x 12 triplex brackets provide structural support when stacking three devices vertically or horizontally into a multi-device assembly. Each pair includes bracketing screws for securing both sides of the assembly. Licensed fire protection contractors and electricians install these brackets as part of a listed firestop system where cable penetration management and rated wall or floor assemblies are required.
These brackets are used in commercial and institutional construction where multiple cable runs pass through fire-rated walls, floors, or partitions. They support stacked configurations of 3M Fire Barrier Pass-Through Devices, making them suitable for larger cable bundles or high-density penetration scenarios. The brackets work alongside the intumescent material and foam smoke seals built into each pass-through device. Sold as a pair to complete mounting on both sides of a firestop assembly.
Designed for use with three 4-inch square 3M Fire Barrier Pass-Through Devices in a 1 x 3 stacked array configuration. Square devices can be arranged in multiple device configurations to meet larger cable management and firestop requirements.
Installation should be performed by a qualified fire protection contractor or licensed electrician familiar with firestop system requirements and applicable building codes. Verify the complete firestop assembly listing before installation to ensure all components meet the required fire rating for the wall or floor assembly. Power down all circuits passing through the penetration before beginning work. Follow the manufacturer assembly instructions for bracket placement and screw torque to maintain system integrity.
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