NHN 350 Overhead Door Closer – Certified Fire-Rated Hydraulic Door Control Solution

The NHN 350 Overhead Door Closer is a high-performance hydraulic door control system engineered for fire-rated single and double leaf doors. Designed for reliability, durability, and smooth operation, this model complies with European EN standards and is certified for use in demanding commercial and institutional environments.

If you are looking for a CE-certified fire door closer with proven long-term performance, the NHN 350 is a dependable solution trusted by professionals worldwide.

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EN 1154 Certified Door Closer for Fire Doors

The NHN 350 is tested and certified in accordance with:

• EN 1154 (EN 1154:1996/A1:2002/AC:2006)

• Certified under Construction Products Regulation (CPR) 305/2011/EU

• Issued by Warrington Certification Limited

This certification confirms the product meets strict European requirements for:

• Self-closing performance

• Durability

• Fire and smoke door suitability

• Corrosion resistance

• Operational efficiency

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Key Features of the NHN 350 Door Closer

1️⃣ Designed for Fire-Rated Doors

The NHN 350 is specifically intended for:

• Fire-rated single leaf doors

• Fire-rated double leaf doors

• Standard fixing position installation

It successfully passes fire and smoke door suitability requirements under EN 1154.

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2️⃣ Exceptional Durability – 500,000 Cycles Tested

This overhead hydraulic door closer is tested for:

• 500,000 opening and closing cycles

• Grade 4 operation angle up to 180°

• Proven long-term mechanical reliability

This makes it ideal for high-traffic commercial environments such as hospitals, offices, schools, and public buildings.

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3️⃣ Efficient Hydraulic Performance

The NHN 350 offers:

• Size 3 closing force performance

• 55% operational efficiency

• Controlled closing time

• Reliable latch control

• Overload performance protection

The hydraulic mechanism ensures smooth, controlled door closing without slamming.

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4️⃣ Wide Temperature Resistance

The unit operates reliably between:

-15°C to +40°C

This makes it suitable for a variety of indoor commercial applications.

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5️⃣ Corrosion Resistance

• Corrosion Grade 3 (96 hours test)

• Fluid leakage protection: Passed

• Damage resistance: Passed

Engineered for durability even in demanding environments.

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6️⃣ Safe & Compliant Materials

The NHN 350:

• Does not contain or release dangerous substances

• Complies with European material safety standards

This ensures safe use in public and regulated buildings.

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Technical Performance Summary

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Why Choose the NHN 350 Overhead Door Closer?

✔ CE-certified fire-rated performance
✔ Tested by a European notified body
✔ Long lifecycle durability
✔ Smooth hydraulic closing control
✔ Suitable for commercial and institutional use
✔ Manufactured by a trusted Japanese brand

Whether you are specifying hardware for fire safety compliance, upgrading door control systems, or installing certified door closers in commercial projects, the NHN 350 delivers safety, durability, and reliability.

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Applications

• Fire-rated commercial doors

• Office buildings

• Educational facilities

• Healthcare facilities

• Industrial buildings

• Public infrastructure

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Conclusion

The NHN 350 Overhead Door Closer combines certified European fire compliance, mechanical durability, and efficient hydraulic performance in one compact system. With 500,000-cycle testing and EN 1154 certification, it is a professional-grade solution for projects requiring safe, controlled door closing in fire-rated applications.