Publish Time: 2025-08-16 Origin: Site
In the field of building safety, few elements are as crucial as functional fire door components. Fire doors are a complex system, not just door panels. Its ability to isolate fire and smoke, buy valuable time for personnel evacuation and emergency response, depends entirely on the performance of each component. This is exactly where the D&D UL series fireproof door hardware stands out. We provide a complete, compatible, and fully UL certified hardware system that has been carefully designed and tested to provide maximum protection for commercial and residential buildings.
UL (Underwriters Laboratories) certification is not an optional recommendation, but an uncompromising benchmark for fire safety in North America and a globally recognized high standard. When a hardware product bears the UL certification mark, it means that the product has undergone comprehensive testing in UL's independent laboratory. It has been proven to perform specific functions normally within its rated time under extreme high temperature and high pressure conditions of standardized fires. In addition, the manufacturer's production process will undergo continuous audits by UL to ensure consistent product quality. The 'file number' (e.g. R38013) is your direct way to obtain this certification, providing traceability and compliance proof for building inspectors, fire captains, and insurance providers.
Our system design aims to work collaboratively to ensure that there are no weak links in your fire door components.
* Fire Rating: 3 Hours (The highest standard rating for hinges)
* Other Certification: ANSI/BHMA Grade 1 2,500,000 cycles & Grade 2 1,500,000 cycles
The door hinge is the hero behind the fire door. Our UL 10C certified hinges are made of high-strength steel or stainless steel, carefully designed to withstand the enormous weight of fire doors without deformation. In the event of a fire, they can prevent the door from sagging or bending, maintaining critical sealing. The ANSI/BHMA Level 1 rating ensures that they can withstand over 2,500,000 cycles of use in high traffic commercial environments, ensuring long-lasting durability before a fire occurs.
* Fire Rating: 3 hours
Fire mortise locks must balance two seemingly contradictory functions: providing security during normal operation and enabling safe and rapid evacuation in emergency situations, while also being able to remain intact in the event of a fire. Our mortise door locks are made of sturdy structures and materials that can prevent melting or jamming at temperatures exceeding 1000 ° C. This ensures that when the lever rotates, the lock tongue can smoothly retract, facilitating escape and preventing personnel from getting trapped.
* Fire Rating: 3 hours
The door closer is the most critical component of the fire door system. Its only function is to ensure that the door can be fully closed and automatically locked, thereby blocking fire and smoke. The UL 228 certified closer we use has been precisely calibrated to provide reliable and stable closure for heavy-duty fire doors. They have adjustable closing and locking speeds to meet accessibility standards, and are designed to operate normally over a wide temperature range, ensuring proper functioning in cold stairwells and building interiors.
*Fire Rating: 3 hours(Fire Exit Hardware) / compliant with UL 305 standard (Panic Hardware)
In emergency situations, instinct will dominate. The design of the panic bar (or panic exit device) aims to facilitate operation - pushing the lever will release the lock buckle. Our devices have passed UL 305 certification, which means they have been tested for reliable operation under immense pressure and frequent use. It is crucial that the entire device—the bar, the latch mechanism, and housing - also has a 3-hour fire rating (File NO.: R40486). This ensures that the device will not be prematurely damaged in the event of a fire, while still providing a reliable escape route.
*Fire Rating: 1/3 hours and 1.5 hours
Our fire rated door viewers are particularly important in residential, hotel, or medical settings. It allows users to safely assess the condition behind the door before opening it. Ordinary door peephole may become a fatal point of failure in a fire. Our door viewer is made of special glass lens and steel/brass body, which can maintain its integrity and ensure that the fire barrier will not be damaged within 1/3 hours or 1.5 hours, depending on the model.
*Commercial buildings: The D&D UL series products are an ideal choice for office buildings, hospitals, schools, hotels, and retail locations. These places have extremely high requirements for life safety, requiring the highest level of durability (compliant with ANSI/BHMA Level 1 standards) under continuous use, and must strictly comply with regulations to meet the requirements of the International Building Code (IBC) and NFPA 80.
*Residential buildings: For multi family residential buildings such as apartments and shared apartments, fire doors at stairwells, corridors, and unit entrances are mandatory requirements by regulations. Our hardware products provide developers and property managers with a guarantee of residents' safety, while also reducing their responsibilities.
Selecting individual UL certified components from different manufacturers can bring risks. And our D&D UL series is designed as a complete system. This means that the design and testing of each component is aimed at seamless collaboration, providing unparalleled peace of mind for designers and builders. This way, you can avoid compatibility issues and ensure that the entire assembly can function as a unified life support system in critical moments.
✅ Full-System Fire Protection – All components tested to 3-hour ratings
✅ Code Compliance – Meets IBC, NFPA 80
✅ Durability Guaranteed – ANSI/BHMA Grade 1/2 for high-traffic areas
✅ Project Support – UL certification files, CAD drawings, and installation guides
For fire doors that save lives, trust the D&D UL Series.
Engineered for maximum safety and compliance, our D&D UL Series offers a full range of UL/cUL-certified fire-rated door hardware, rigorously tested to meet the most demanding building codes. Each component is backed by official UL file numbers, ensuring traceability and reliability for architects, contractors, and facility managers.
Contact us Now:
Contact: David Jian
Mob:0086-139 2903 7292
Email: David@dndhardware.com, sales@dndhardware.com,
Jobby Zhang
Mob:0086-137 2599 9617
Email: jobby@dndhardware.com
D&D HARDWARE INDUSTRIAL CO.,LTD
ADD:12th Floor, Building 2, No.898, KeChuang Technical Zone, Jiangmen Avenue, Pengjiang District, Jiangmen City, Guangdong, China (Postcode:529000)
Tel: +86-750-3856396
Fax: +86-750-3856395