The KEYMAN B400 Series Heavy-Duty Commercial Lock is engineered for superior performance in demanding environments. It boasts a rigorous UL 3-hour fire rating , enhancing safety by helping to contain fires. Its robust construction ensures exceptional durability, exceeding industry standards for longevity and reliability in commercial settings . This combination of top-tier fire protection and strong security makes it an ideal choice for various applications, including office buildings, retail spaces, and industrial facilities