Central storage must have what minimum fire-resistance rating?

• A. One Hour
• B. Thirty Minutes
• C. Two Hours
• D. Four Hours

Answer: (A)

Central storage is protected by a fire-resistance rating to keep heat and flames from reaching the stored cylinders and the gas distribution system. The minimum required rating is one hour, meaning the walls and doors around the storage area are designed to withstand a standard fire exposure for 60 minutes. This provides a critical window for fire suppression and safe shutdown or evacuation of the area, while reducing the risk of cylinder heat buildup or rupture. A shorter rating (like 30 minutes) wouldn’t reliably contain a typical room fire, while higher ratings (2 or 4 hours) are not usually required for standard central storage unless local codes or specific high‑hazard conditions dictate.