FlameSafe Fire-resistant File offers asbestos-free fire resistance up to 1700 degrees for up to one hour. File is insulated in drawer face and between drawers. Mechanical safety interlock on four drawers inhibits more than one drawer from opening at a time. Design features telescoping suspension, four hangrails per opening, and plastic recessed drawer pulls. Lock is not core removable. U.L. listed. Certified by SCS to be in compliance with specific indoor air quality emission requirements.