THESE FIREPROOF FILE CABINETS MEET UL IMPACT REQUIREMENTS CABINET REMAINS LOCKED AND INTACT WITHOUT DAMAGE TO PAPER CONTENTS AFTER ENDURING 1500°F A DROP FROM 30'H AND HEATING TO 1500°F AGAIN. MEETS THE UL 2000°F EXPLOSION HAZARD RATING AND THE CLASS 350 ONE HOUR FIRE RATING; PROTECTS PAPER CONTENTS WITHOUT DAMAGE FOR 1 HOUR WHEN SUBJECTED TO 1700°F. CABINET CONSTRUCTION IS INSULATED WITH 100 GYPSUM REINFORCED BY A 1"" X 2"" LATTICE OF 14 GAUGE STEEL WIRE WELDED WITH ALUMINUM. THE CONSTRUCTION MAINTAINS EACH DRAWER AS A SEPARATE INSULATED COMPARTMENT FOR MAXIMUM PROTECTION. ALSO DESIGNED TO PROTECT CONTENTS FROM SPRINKLERS AND FIRE HOSES.