Firestop Pillows, Blocks, Plugs & Composite Sheets

3M Fire Barrier Electrical Box Inserts are a flexible, one-piece fire-rated intumescent insert used to protect electrical boxes by placing inside the box. When exposed to fire, the insert expands to fill up the box preventing the spread of fire and...

3M Fire Barrier Electrical Box Inserts are a flexible, one-piece fire-rated intumescent insert used to protect electrical boxes by placing inside the box. When exposed to fire, the insert expands to fill up the box preventing the spread of fire and...

3M Fire Barrier Electrical Box Inserts are a flexible, one-piece fire-rated intumescent insert used to protect electrical boxes by placing inside the box. When exposed to fire, the insert expands to fill up the box preventing the spread of fire and...