UL 10C and UL 10B are two distinct fire-test standards for door assemblies used in the United States. UL 10C applies to positive pressure fire door assemblies, while UL 10B applies to neutral pressure conditions. For most modern commercial buildings, UL 10C is the required standard—and the locks ins

UL 10C is an American standard for positive pressure fire tests of door assemblies, including the locks installed within them. A UL 10C certified door lock has been independently verified to maintain its structural and functional integrity under realistic fire conditions — including the pressurized

What Makes UL Fire Rated Mortise Locks the First Choice for Fire Door Contractors?When you are managing a commercial construction project, every hardware decision carries liability. Fire doors are not just building components—they are life-safety systems. At D&D HARDWARE Factory, we manufacture UL L

When you walk through a commercial building, a hospital, or a school, you likely pass through dozens of fire doors without a second thought. These doors are designed to compartmentalize a building, preventing the spread of deadly smoke and flames during an emergency. However, a fire door is only as

Many buildings use mortise locks to ensure safety. From this we can know that when choosing a mortise lock, safety is the most important consideration. The mortise locks can be used in commercial and residential applications and provide strong security.The American mortise lock is the best choice fo