NHN 350 Overhead Door Closer

NHN 350 Overhead Hydraulic Door Closer

The NHN 350 is a compact overhead hydraulic door closer designed for controlled self-closing of commercial, institutional and fire-rated doors. Its reversible design allows installation on both left- and right-handed doors, while the hydraulic mechanism provides controlled closing and final latching.

Key technical specifications

• Product: NHN 350 overhead door closer
• Closing force: EN 2–4
• Recommended door weight: 40–100 kg
• Applicable door width: 850–1100 mm
• Maximum opening angle: 180°
• Closing-speed adjustment: 180°–15°
• Latching-speed adjustment: 15°–0°
• Installation: reversible for left- and right-handed doors
• Fire-door suitability: certified/tested for fire-rated applications
• Standard: EN 1154
• Corrosion resistance: Grade 3 / 96-hour test as stated on the current NHN page
• Operating temperature: -15°C to +40°C according to the current NHN page
• Durability: 500,000 opening/closing cycles stated on the current NHN page

Hydraulic closing control

The NHN 350 uses hydraulic control to regulate the door-closing movement. The closing speed and final latching speed can be adjusted independently, helping the installer achieve controlled closing rather than uncontrolled slamming.

Fire-rated door applications

The current NHN product page identifies the NHN 350 as suitable for fire-rated doors and provides EN 1154 certification and fire-resistance documentation. Independent product references for the NHN 350 also identify EN 1154 certification, fire-door suitability, EN 2–4 power adjustment and 850–1100 mm door width. These specifications were cross-checked before preparing this product content.

Installation and application

The NHN 350 is suitable for commercial and institutional applications where reliable self-closing and controlled door movement are required, including offices, schools, healthcare facilities, public buildings and other high-use environments. Its reversible configuration supports both left- and right-handed doors.

SEO article – NHN 350 Door Closer

The NHN 350 door closer is a professional overhead hydraulic door closer designed for reliable and controlled self-closing of interior and commercial doors. Manufactured under the NHN brand, the 350 series combines adjustable closing force, hydraulic speed control and a reversible installation design in a compact door-control solution.

With an adjustable EN 2–4 closing force, the NHN 350 is suitable for doors with a typical weight range of 40–100 kg and widths of approximately 850–1100 mm. The two-stage hydraulic adjustment allows the closing speed and final latching speed to be controlled separately, helping provide smooth and consistent door operation.

The NHN 350 is also designed for use with fire-rated doors. The current manufacturer page lists EN 1154 certification and provides fire-resistance and performance documentation. Independent product references were used to cross-check the main technical specifications, including EN 2–4 adjustment, 850–1100 mm door width, reversible installation and fire-door suitability.

For commercial buildings, offices, schools, healthcare facilities and other projects requiring dependable door closing, the NHN 350 offers a practical hydraulic solution with controlled operation and long-term durability.