FireKing® files carry Underwriters’ Laboratories Class 350—one- or two-hour ”Record Protection Equipment classified as to Fire and Impact Resistance.” During testing, files are subjected to temperatures of 1,700° F for one or two hours and impact-rated to simulate a collapsing ceiling or wall. Insulation between drawers makes each drawer a separate, fireproof unit. Water-resistant—designed to prevent water damage resulting from sprinklers and fire hoses. Drill- and pick-resistant, UL Listed high-security key lock. Manufacturer's lifetime warranty on all parts. Free after-fire replacement on all cabinets. UL one-hour fire and impact tested.