SUMBIN ANSI Grade 1 Commercial Mortise Lockset with UL Fire Rating This is a professional-grade, heavy-duty mortise lock​ engineered for demanding commercial door​ applications. It is a complete mortise lock set​ featuring a robust architectural mortise lock​ body and trim, designed for superior security and life safety. Certified to the highest ANSI Grade 1​ standard, it delivers exceptional durability, strength, and cycle life for high-traffic environments like office buildings, hospitals, and apartment complexes. Importantly, this UL listed fire lock​ is tested and rated for use on fire-rated doors. It meets UL 10C​ requirements for positive pressure fire tests, making it suitable for labeled fire door assemblies. As a fire exit mortise lock, it provides the necessary exit trim​ functionality (such as lever operation for easy egress) while maintaining the door's required fire-resistive rating, which may be up to 3 hours. This security mortise lock​ is built to install on a variety of door materials, including hollow metal doors, steel doors, and solid core wood doors. It is available with different trim options like lever trim​ and can be specified with various function codes​ (e.g., entry, storeroom) to suit your access control needs. The universal hand​ design often simplifies ordering and installation. For the highest level of protection, choose a model with a Grade 1 mortise deadbolt. Note:​ This is a fire door hardware​ component. Professional installation by a qualified technician is mandatory to ensure proper function and compliance with local building and fire codes. Always verify compatibility with your specific door type, fire rating, and handing before purchase.