3M Fire Barrier Putty Sleeve Kit DT 200 2in Round

3M Fire Barrier Putty Sleeve Kit DT 200 is a ready-to-install 2-inch round firestop sleeve that helps seal cable penetrations against the spread of fire and smoke in walls and floors.

This kit is designed for both new-build and retrofit installations where data and telecommunications cables pass through rated assemblies. Tested for up to 4 hours in through-penetration systems (ASTM E814 / UL 1479), the DT 200 sleeve combines a molded putty liner and a rolled lip sleeve to simplify cable routing while maintaining firestop performance without a separate gasket.

How does the DT 200 sleeve keep cable penetrations secure during a fire?

The sleeve uses intumescent putty and a fitted bracket system to block fire and smoke movement through openings created for cables. Under heat, the putty expands to fill voids around cables and the sleeve, helping restore compartmentation.

• Tested up to 4 hours per ASTM E814 (UL 1479).
• Putty liner expands under heat to seal gaps around cables.
• Bracketed sleeve holds position in wall or floor assemblies.
• Rolled lip eases cable entry and reduces damage risk.

Will this work for new installations and retrofits?

Yes — the kit is built to accommodate both fresh installs and existing cable runs so you don't need to rework cabling. The sleeve accepts live cables, so technicians can add firestopping without disconnecting active telecom or data lines.

• Designed for retrofit use around existing cable bundles.
• No gasket required, shortening installation time.
• Compatible with typical data and telecom cable diameters.
• Brackets prevent sleeve slippage during retrofit mounting.

How is the DT 200 installed — do I need special tools or materials?

Installation is straightforward: position the sleeve in the penetration, secure the brackets to the opening, and route cables through the rolled lip. No separate gasketing or complex components are required, though follow the manufacturer's instructions for fire-rated assemblies and sealing practices.

• Ready-to-install kit includes sleeve and mounting brackets.
• Rolled-out lip supports clean cable entry and reduces abrasion.
• Simple mechanical fixings secure the sleeve in place.
• No additional gasket or sealant is necessary for the rated system.

What should I verify before specifying this product?

Confirm wall or floor assembly ratings and the allowed cable types and bundle sizes for the tested system. Ensure compatibility with your building's firestop design and reference the applicable UL/ASTM listings to match the required through-penetration rating.

• Check UL 1479/ASTM E814 listing details for assembly constraints.
• Verify maximum cable bundle diameter for the 2-inch sleeve.
• Confirm mounting method fits your wall or floor construction.
• Follow local code and firestop inspection requirements.

Who is this for: The 3M Fire Barrier Putty Sleeve Kit DT 200 is suited to contractors, low-voltage technicians, facilities teams, and specifiers who need a reliable, code-tested firestop solution for data and telecom cable penetrations. It’s ideal where quick retrofit installation, minimal downtime, and a tested fire-rating are required — such as communications rooms, office fit-outs, multi-tenant buildings, and renovation projects where active cabling must remain in place.