Protected stair enclosures provide which level of protection?

• A. The highest degree of protection.
• B. Required by code to be protected by gypsum.
• C. Required to have a 4 hour fire rating.
• D. Allowed to have unprotected openings.

Answer: (A)

Protected stair enclosures are built to keep the stairway safe during a fire by surrounding it with fire‑resistant construction and self-closing, smoke‑resistant doors. This containment helps prevent heat and smoke from invading the stairwell, preserving a tenable path for occupants to evacuate and for responders to operate. Because the stairs are isolated from the fire area for a longer period than other routes, they provide the highest level of protection for those evacuating.