Heavy-duty, BHMA certified under ANSI A156.13 Series 1000 Grade 1. UL listed for use on fire doors. UL listed to Canadian Safety Standards. Conforms to standards UL10C ‘Positive Pressure fire tests of door assemblies’ and UBC 7-2 (1997). SARGENT Mortise Locks are designed and constructed with high-quality components to provide maximum security, performance, and durability.