What does UL Class 350 mean on a fireproof cabinet label?

UL Class 350 means the cabinet is tested and certified to maintain its interior below 350°F for the rated duration (30 min, 1 hour, or 2 hour) while exposed to an external fire that reaches 1,700°F. Since paper chars at 451°F, the 350°F interior limit gives you a meaningful safety margin for document survival. This is the standard rating for commercial paper document storage and the most common classification you'll see on fireproof office cabinets. Every standard fireproof cabinet at FindOfficeFurniture.com meets at minimum Class 350-1 Hour — call 888-719-4960.