What does a UL fire rating actually tell you about a cabinet?

A UL fire rating tells you two things: the class (which defines the maximum interior temperature allowed) and the time duration (how long the cabinet maintained that interior temperature under test conditions). The most common class for office documents is Class 350 — interior below 350°F while paper chars at 451°F, giving you a safety margin. Class 150 and Class 125 exist for photographic film and digital media respectively. The time rating (30 min, 1 hour, 2 hour) reflects how long the cabinet was tested at an external fire temperature reaching 1,700°F. Every fireproof cabinet at FindOfficeFurniture.com includes its full UL rating — call 888-719-4960.