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SKU 7100138833
Legacy SKU 98040054722
UPC 00051115165788
Part Number FB249SL
Product Number FB249SL

3M™ Fire Barrier Self-Locking Pillows are self-contained firestops ideal for medium to large through penetrations. Pillows feature Interlocking strips – installers can easily lock multiple pillows together to achieve precise fill and compression with no additional support required. Intumescent fire-rated pillows are designed to expand during a fire, locking themselves around vital components.

  • Intumescent pillows are designed to expand and lock together for tight seal against flame, smoke and toxic gasses
  • Easy to install, remove and reconfigure to help save time and labor
  • Interlocking strips let installers quickly lock pillows together by hand for fast, accurate firestops
  • Available in multiple sizes and can be cut in the field for precise fill and compression
  • No wire mesh or additional support required
  • Firestop tested for up to 3 hours in accordance with ASTM E 814 (UL 1479) and CAN/ULC-S115
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On it's way to you October 6   


Minimum Order 24 Items
Order Increment 24 Items
  Multiple Application Use
  Efficient Barriers
  Fast Shipping
  Industry Low Price
Product Dimensions
Imperial Metric
Weight 0.3853 LBS
Width 0 4.0 0 102.0
Length 0 9.0 0 229.0
Height 0 np
Thickness 0 2.0
Shipping Dimensions
Weight 11.35 lb
Length 17 in
Width 12.9 in
Height 10 in
Color Red


  1. What are 3M™ Fire Barrier Self-Locking Pillows FB249SL?

    3M™ Fire Barrier Self-Locking Pillows FB249SL are a firestop device designed to help prevent the spread of smoke and flames through small openings in walls, floors and ceilings.

  2. What size are these pillows?

    These pillows come in small size, measuring 2 inches x 4 inches x 9 inches (5.1 cm x 10.1 cm x 22.9 cm).

  3. How do I install them?

    Installation instructions vary depending on the application, but generally you would place the pillows tightly against or within the penetration you wish to block and use a tool to compress it into place.

  4. How many pillows come per case?

    Each case contains 24 small-sized self-locking fire barrier pillows.

  5. Are they safe for all applications?

    While this product can be used in many different types of buildings and construction materials, we always recommend that customers consult with their local building codes or fire safety officials before selecting any type of fire protection system for their specific needs.

For industrial/occupational use only. Not for consumer sale or use.
3M industrial and occupational products are intended, labeled, and packaged for sale to trained industrial and occupational customers for workplace use.  Unless specifically stated otherwise on the applicable product packaging or literature, these products are not intended, labeled, or packaged for sale to or use by consumers (e.g., for home, personal, primary or secondary school, recreational/sporting, or other uses not described in the applicable product packaging or literature), and must be selected and used in compliance with applicable health and safety regulations and standards (e.g., U.S. OSHA, ANSI), as well as all product literature, user instructions, warnings, and other limitations, and the user must take any action required under any recall, field action, or other product use notice.  Misuse of 3M industrial and occupational products may result in injury, sickness, death, or property damage.  For help with product selection and use, consult your on-site safety professional, industrial hygienist, or other subject matter expert.
Simply a Better Way to Firestop

Introducing a simpler solution to the challenges of firestopping medium and large through penetration openings: 3M™ Fire Barrier Self Locking Pillows. These pillows combine intumescent fire-rated material and a range of sizes with interlocking strips that allow installers to easily lock multiple pillows together without tools. The pillows can also be cut and resealed in the field, making it easier to assemble ideally-sized firestops for specific penetrations in floors and walls. No wire mesh, steel cover plates, or other additional support is required. The pillows are fully re-enterable and reusable, and the interlocking strips can be released by hand, making it easy to reconfigure firestop pillows as additional services are added or relocated.

Recommended Applications
  • Firestopping medium to large openings containing power or communication cables and conduits
  • Gypsum wall, concrete or block wall and concrete floors
  • Blank openings up to 540 sq. in. (3483 sq. cm)
  • 1 or 2 cable racks or trays per penetration
  • Conduit bank, inner duct cable and cable racks or tray applications
  • Can be used in conjunction with 3M Moldable Putty+
Fully Tested and Approved

These intumescent, graphite-free 3M™ Fire Barrier Self Locking Pillows are designed to expand during a fire, locking themselves into place to protect vital components and forming a tight seal against the spread of flame, smoke, and toxic gases. They are firestop tested up to 3 hours in accordance with ASTM E 814 (UL 1479) and CAN/ULC-S115 when installed in listed systems.

The Science of Better Fire Protection from 3M

Since 1925 when a 3M lab assistant invented masking tape, 3M has been applying science to life – developing adhesive products and technologies that help entire industries and individual businesses worldwide. The work that began with a single 3M engineer now spans decades and generations. And all of it goes into each 3M adhesive, sealant, protective coating, and firestop system like 3M™ Fire Barrier Self-Locking Pillows – to improve performance and to help businesses operate faster, better, and more efficiently.

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