3M™ Fire Barrier Block B258, 3M™ Fire Barrier Plank PK39, and 3M™ Fire Barrier Plug PLG2 and PLG4 are smoke, sound, and firestopping pre-formed foam units for medium to large openings in wall and floor through-penetrations. Simple to use. During a fire, product maintains a tight firestop against smoke and flame.

Features:

• Works with 2-inch Round 3M™ Fire Barrier Pass-Through Device to help prevent the spread of smoke and fire
• Enhance cold and hot smoke seal
• Plays a part in a system that allows pass-through device to achieve UL classified L-Rating
• Foam plugs are part of a hassle-free firestop method