FireKing 3-Hour Fire, Impact and Burglary UL Class 125 Rated Data Safes provide the ultimate in protection against fire, dust, electrostatics and accidental damage for your computer media. They're our highest rated safes and are perfect for businesses with large-capacity electronic storage needs. FireKing 3-Hour Data Safes are available in five sizes, all featuring the UL Class 125 3-hour fire and impact rating*, plus the UL - RSC Burglary Rating for tough protection against break-in.