When we think about fire safety, attention usually goes to visible systems like alarms, sprinklers, and exits. Yet one of the most critical protections is often hidden from view: firestopping. Firestopping is a passive fire protection system that seals openings in fire-resistance-rated walls, floors, and ceilings, helping prevent the spread of smoke, heat, and flames during a fire. Required under Chapter 7 of the International Building Code, these systems play a vital role in life safety. With most fire-related deaths caused by smoke inhalation, properly installed firestopping can truly be the difference between containment and catastrophe.