The Fire Rated Concealed Door Closer is positioned as a professional-grade solution for commercial and fire-rated door systems where safety, aesthetics, and controlled performance are essential. Designed for concealed installation, it integrates seamlessly into the door leaf or frame, preserving a clean and modern appearance while delivering reliable door control. Certified to UL standards for 3-hour fire-rated doors (UL 10C), it helps maintain door integrity during fire conditions, supporting effective compartmentation and occupant safety. With stable closing force, smooth operation, and optional hold-open functionality, this concealed closer is well suited for fire doors, interior commercial doors, and high-traffic applications in offices, hotels, hospitals, schools, and other public or code-compliant buildings.
Technical Specifications
Max. Door Width
950mm
Door Weight Capacity
40–65kg
Power Size
EN3
Max. Opening Angle
Dual Swing 130°
Material
Aluminum Body
Certifications
UL228, UL10C (3 Hours Fire-Rated), EN1154
Special Feature
Optional Hold-Open Function
Product Images and Videos
Product Features & Advantages
Concealed Overhead Design: The concealed overhead design allows the door closer to be completely hidden within the door leaf and frame, preserving clean architectural lines and a refined interior appearance. In commercial environments such as hotels, office buildings, and premium retail spaces, this concealed installation helps maintain consistent design language while reducing visual clutter. At the same time, hiding the closer protects it from accidental impact, vandalism, or misuse in high-traffic areas, improving long-term reliability.
UL Fire-Rated Certification: The DDDC055 is UL10C listed for 3 hours (File No.: R40717) and compliant with UL228, confirming its ability to perform reliably as part of a fire-rated door assembly. Under fire conditions, the closer maintains controlled closing performance, helping prevent the spread of smoke and flames through door openings. This level of certification is essential for commercial projects where fire compartmentation and life safety compliance are mandatory.
Precision Cast Aluminum Body: The closer body is manufactured from precision cast aluminum, providing a strong yet lightweight structure designed for intensive commercial use. Aluminum construction offers excellent resistance to corrosion and environmental wear, making the closer suitable for long-term installation in air-conditioned, humid, or frequently used interior spaces. This material choice contributes to consistent performance while reducing maintenance and replacement costs over the product lifecycle.
Fixed Spring Force #3: Equipped with a fixed spring force size #3, the door closer delivers stable and predictable closing force for doors weighing between 40 and 65 kilograms. This configuration ensures reliable self-closing action without excessive resistance, balancing user comfort with fire door safety requirements. The fixed spring setting also simplifies specification and installation for standard commercial fire door applications.
Optional Hold-Open Function: An optional hold-open function can be integrated to allow the door to remain open during normal operation when required by the building’s usage pattern. This is particularly useful in spaces such as hotel lobbies, hospital corridors, or office common areas where temporary open access improves circulation and convenience. When correctly specified, the hold-open function supports daily usability while remaining compatible with overall fire safety planning.
Dual Swing 130° Capability: The door closer supports bidirectional door movement with a maximum opening angle of 130 degrees, allowing smooth two-way operation in busy commercial environments. This capability is especially beneficial in areas with continuous pedestrian flow, such as mall entrances or office stairwells, where flexible door movement improves efficiency without compromising controlled closing performance.
Application Scenarios
Hotel Corridors: In hotel corridors, the concealed overhead door closer helps maintain a quiet, refined environment that aligns with upscale interior design standards. Based on practical project experience, concealed closers are favored because they minimize visual distraction and reduce the risk of damage from housekeeping carts or luggage trolleys. At the same time, the UL fire-rated performance ensures that corridor fire doors close reliably in emergency situations, making the DDDC055 a suitable choice for hotel operators balancing aesthetics, durability, and safety compliance.
Mall Fire-Rated Entrances: Shopping mall entrances experience constant, high-volume foot traffic throughout the day. The dual swing 130-degree capability allows doors to open freely in both directions, improving traffic flow and user convenience during peak hours. In fire-rated entrance applications, the closer ensures automatic closing when required, supporting fire compartmentation strategies. This makes the DDDC055 well suited for mall projects where operational efficiency and fire safety must be addressed simultaneously.
Office Building Stairwells: Office building stairwells are critical fire escape routes where reliable fire-rated doors are essential. The concealed door closer ensures consistent self-closing performance without compromising the clean, professional appearance expected in modern office interiors. For architects and facility managers, the DDDC055 provides confidence that fire separation requirements are met while maintaining a discreet hardware presentation.
Certifications and Compliance
UL10C Listed (3 Hours Fire-Rated): UL10C listing confirms that the DDDC055 meets fire test requirements for fire door assemblies, maintaining automatic closing performance under high-temperature conditions to limit the spread of fire and smoke.
UL228 Certification: Compliance with UL228 verifies that the door closer meets safety and performance standards for door control devices used in commercial applications, ensuring reliable operation over time.
EN1154 Standard: EN1154 compliance demonstrates that the door closer meets European requirements for durability, safety, and controlled closing performance, supporting use in international and EU-regulated projects.
ISO 9001 Quality System: The product is manufactured in an ISO 9001 certified facility, ensuring consistent quality control across material sourcing, production, assembly, and final inspection processes.
Production Process & Quality Control
Material Sourcing: High-grade aluminum and internal components suitable for fire-rated commercial applications are carefully selected to ensure durability and consistent performance.
Precision Manufacturing: CNC machining and controlled casting processes are used to achieve accurate dimensions and smooth surface finishes, supporting reliable long-term operation.
Assembly & Calibration: Hydraulic mechanisms, springs, swing arms, and optional components are assembled and calibrated to meet UL and EN1154 performance standards.
Quality Inspection: Each unit undergoes functional testing, including closing performance and visual inspection, to identify any defects before shipment.
Certification Testing: Random sampling is conducted for certification-related testing to verify continued compliance with UL and EN1154 requirements.
Packaging: Products are packed in protective cartons, either standard or customized, to prevent damage during transportation and ensure efficient project logistics.
Installation Steps
Prepare Door & Frame: Before installation, the door and frame should be checked to confirm that the door width does not exceed 950mm and the door weight falls within the 40–65kg range specified for the DDDC055. It is also essential to verify that the door assembly meets fire-rated requirements and is properly prepared for concealed hardware installation to ensure compliance and performance.
Mount Concealed Closer Body: The precision cast aluminum closer body is installed into the concealed cavity above the door frame. Accurate positioning and alignment are critical to ensure smooth interaction with concealed hinges and door locks, as well as long-term operational stability. Proper mounting at this stage directly affects closing performance and durability.
Attach Swing Arm Assembly: The swing arm is connected between the closer body and the door leaf, forming the mechanical link that controls door movement. Adjustment is carried out to achieve the required 130-degree opening angle while maintaining controlled motion throughout the door’s travel. Correct arm installation ensures balanced operation and reduces mechanical wear.
Activate Optional Hold-Open Function (If Requested): If the project specification includes a hold-open function, the mechanism is installed and adjusted at this stage. Careful setup ensures that the door can remain open during normal use while still functioning correctly within the overall fire door system when required.
Verify Operation & Integration: After installation, the door is tested for closing speed, latching performance, and overall movement. Compatibility with door stops, door accessories, and other hardware components is checked to confirm that the complete door system operates smoothly and safely under real-use conditions.
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