Which term describes a combination of a fire door, a frame, hardware, and other accessories installed in a horizontal plane to provide fire protection to a through-opening in a fire-resistance-rated floor?

Which term describes a combination of a fire door, a frame, hardware, and other accessories installed in a horizontal plane to provide fire protection to a through-opening in a fire-resistance-rated floor?

• A. Floor Fire Door Assembly
• B. FireBarrier
• C. Smoke Barrier
• D. Thermal Barrier

Answer: (A)

Protecting a through-opening in a fire-resistance-rated floor requires a floor fire door assembly. This term refers to the complete package—the door, frame, hardware, and related accessories—that is installed in the horizontal plane of the floor to maintain the floor’s fire rating across the opening. The assembly is listed for floor installation and typically includes specialized hardware and a seal to keep resistance intact where the opening interrupts the floor. This is distinct from vertical fire barriers (which stop fire between rooms), smoke barriers (which control smoke movement), or thermal barriers (insulation for heat transfer), because only the floor fire door assembly is specifically designed to preserve fire resistance across a through-opening in a floor.

Protecting a through-opening in a fire-resistance-rated floor requires a floor fire door assembly. This term refers to the complete package—the door, frame, hardware, and related accessories—that is installed in the horizontal plane of the floor to maintain the floor’s fire rating across the opening. The assembly is listed for floor installation and typically includes specialized hardware and a seal to keep resistance intact where the opening interrupts the floor. This is distinct from vertical fire barriers (which stop fire between rooms), smoke barriers (which control smoke movement), or thermal barriers (insulation for heat transfer), because only the floor fire door assembly is specifically designed to preserve fire resistance across a through-opening in a floor.