3M Fire Barrier Putty Sleeve Kit DT 400 – 4 in Round, 1/case | Firestop for Data & Telecom

Overview

Introducing the 3M Fire Barrier Putty Sleeve Kit DT 400, a ready-to-use firestop solution crafted for data and telecom cable penetrations in walls or floors. This 4-inch round kit is tested for up to 4 hours of fire-rated through-penetration performance in line with ASTM E814 (UL 1479). Designed for both new installations and retrofits, it aims to provide a practical, dependable option for managing fire and smoke pathways around cables.

One notable attribute is the elimination of gasket handling, which can streamline installation. The sleeve’s rolled lip helps cables enter smoothly, while brackets and the sleeve work together to reduce movement during application. The DT 400 kit supports both new construction and retrofit data and telecom cable firestop tasks, making it a versatile addition to many on-site workflows.

Key features

• Ready-to-install kit for complete cable firestop or blank firestop installations
• Tested up to 4 hours for fire-rated through-penetration systems in accordance with ASTM E814 (UL 1479)
• No gasket required, simplifying the installation process
• Rolled-out lip on the sleeve guides cables and reduces entry friction
• Brackets and sleeve collaborate to help prevent slipping during installation
• Supports both new and retrofit data and telecom cable firestop installations

Ideal applications

• New construction projects needing reliable firestop around data/telecom cables
• Retrofit or existing installations where penetrations require a tested solution

How it works

The kit brings together a sleeve and brackets designed for straightforward use around cable penetrations. The smooth entry path provided by the rolled lip helps installers feed cables with less resistance, while the brackets help hold components in place to minimize shifting as you work. With a focus on ease of use, the DT 400 kit integrates into common firestop workflows without requiring additional gaskets or fittings.

In practice, technicians can deploy the kit in both new and retrofit projects to address penetrations through walls or floors where fire and smoke containment is important. The combination of a pre-packaged sleeve plus mounting hardware offers a pragmatic approach to meeting firestop objectives while supporting efficient field installation.

Why choose 3M

3M brings a long history of building science and validated firestop solutions. The DT 400 Putty Sleeve Kit consolidates essential components into a single, ready-to-use package designed to fit typical data and telecom cabling scenarios. It presents a practical option for teams seeking a dependable, straightforward firestop solution without overpromising outcomes.