When it comes to doors, hinges is very important. Their style and functionality have a huge effect on the performance of your doors. The good news is that a wide range of hinge options are available, so there's an excellent chance there's a hinge out there that's right for your application.
UL is an acronym for D&D hardware which is an independent product safety certification organizations. UL develops standards by which they test fire rated door hardware to verify that it meets certain safety requirements during use, or in the event of a fire or other circumstances.
Fire doors are an important part of a building's passive fire protection system, and doors in a means of egress provide life safety by allowing people to exit quickly when necessary. So you need fire rated door hardware which can protect life safety with fire rated door.
The fire rating classification of the wall into which the door is installed dictates the required fire rating of the door. The location of the wall in the building and prevailing building code establish the wall's fire rating.
Steel fire doors are "rated" by time (in minutes or hours) that a door can withstand exposure to fire test conditions. Hourly ratings include 1-1/2-hours, 1-hour, 3/4-hour, and 1/3-hour, with the maximum rating required of any swinging type fire door being three hours.
Fire rated doors serve a purpose. They are manufactured in a way that is to help reduce the spread of fire and smoke. Fire rated doors allow occupants time to safely exit the structure during a fire or to allow for an area of refuge within the building that protects them until fire service can arrive. These fire rated doors are also part of the building's design and serve to protect fire service personnel during fire suppression. When the door is not properly latched in its frame it loses its effectiveness. When they are not properly maintained they are of no value during a fire making the design and purpose of the door obsolete.
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