3M Fire Barrier Pillows FB269, Medium, 2 in. x 6 in. x 9 in.

3M Fire Barrier Pillows are self-contained, intumescent products designed for use in through-penetration firestops, providing up to 3 hours of protection. This fire barrier pillow expands to form a hard char that tightly seals against flame spread, smoke and toxic gases. Pillows are also engineered to be re-enterable and re-useable for new or retrofit installations.