STI SpecSeal 4″ FireStop Ready Split-Sleeve

The STI SpecSeal® 4″ FireStop Ready® Split-Sleeve is a complete firestop pathway solution designed to seal cable penetrations through fire-rated walls and floors while allowing installation around existing cables. This split-sleeve system provides a fast, code-compliant way to maintain fire-rated barriers in data centers, telecommunications rooms, and structured cabling environments.

The sleeve features a two-piece split design that easily assembles around previously installed cable bundles, eliminating the need to disconnect or reroute cables during installation. Once installed, the sleeve and escutcheon plates securely fasten to the wall or floor, forming a durable pathway for cables while helping block the passage of fire, smoke, and hot gases.

Each kit includes preformed steel sleeve halves, two-piece escutcheon plates with intumescent gaskets, and SpecSeal® firestop putty for sealing the cable openings. The intumescent materials expand when exposed to heat, helping maintain the integrity of fire-rated assemblies during a fire event.

Designed for both new and retrofit cable installations, the 4-inch split sleeve is suitable for cable penetrations through walls or floors in commercial and institutional buildings.

Key Features

• 4″ split firestop sleeve for cable penetrations
• Two-piece split design installs around existing cable bundles
• Includes steel sleeve halves, escutcheon plates, intumescent gaskets, and firestop putty
• Intumescent materials expand during fire exposure to block flames and smoke
• Compatible with walls and floors up to approximately 10″ thick
• Ideal for data centers, telecom rooms, and structured cabling pathways
• Helps maintain UL-classified fire-rated assemblies

Protect cable pathways while maintaining fire-rated wall integrity. Order the STI SpecSeal 4″ FireStop Ready Split-Sleeve today for fast, code-compliant cable penetrations.