• Explosion proof
• Compact
• Built-in muffler
• unique tracking order for each fan. 
• three layer anti-corrossion painting. 
• largest diameter 5meters! 
• Each hub is annealed to remove internal stress.Durable enough. 
• Orthogonal 3D Twisted Blade Technology of Bend and Sweep Combination,Simulated Dune Principle. 
• In line with international standards, 1000: 1.5~2.5, to ensure that the impeller works more safely and efficiently. 

Product-related News:

DECENT MACHINERY Welcomes East African Mining Partners for In-depth Mine Fan Cooperation



DECENT MACHINERY Welcomes Top Southeast Asian Copper Mining Enterprise for Strategic Cooperation Talks,New Partnership Secured



DECENT MACHINERY Forges Long-Term Strategic Partnership with Leading Southeast Asian Mining Conglomerate

The SDF(B) Series Counter-Rotating Tunnel Ventilation Fan is a high-pressure ventilation solution designed for underground mining, tunnel construction, and industrial airflow control. Its dual-impeller counter-rotating design significantly improves airflow efficiency, minimizes energy loss, and enhances ventilation performance.

Key Features of SDF(B) Series Tunnel Ventilation Fan

• Counter-rotating axial flow impellers deliver high-pressure airflow, enhanced air circulation, and minimal turbulence.
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• Low-noise operation, with silencers integrated at both inlet and outlet, ensuring compliance with industrial ventilation noise regulations (JB/T8690).
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• Advanced dynamic balancing system guarantees vibration-free performance, adhering to JB/T8689 vibration testing standards.
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• Corrosion-resistant steel construction, treated with arc flame spraying for maximum durability and wear resistance.
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• Compact design, ensuring long-distance air supply and optimized airflow control for tunnel construction projects.
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• Adjustable blade angles, allowing flexibility to meet various tunnel ventilation requirements, including high-altitude environments.
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• User-friendly maintenance, with a service lifespan exceeding 15 years, ensuring sustained high efficiency in demanding tunnel conditions.
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• Manufactured under strict national and industry regulations, with each unit fully tested and issued a certificate of compliance before shipping.

Installation and Operating Conditions

• 1. Versatile installation options: The SDF(B) fan can be wall-mounted or floor-mounted within the tunnel.

• 2. Duct diameter selection: The air duct diameter should be larger than the impeller diameter for optimal ventilation performance.

• 3. Recommended ducting: Flexible ducts with an air leakage rate below 1% should be used to maximize airflow efficiency.

• 4. Steel ring negative pressure ducts are not permitted, ensuring consistent airflow stability and efficiency.

Use and Maintenance Guidelines

1. 1. Pre-Operation Checks

   • ​Inspect all bolts, fasteners, and connection points for proper security.

   • Ensure that the impeller rotates smoothly without unusual noise or vibrations.

   • Conduct a test run to verify the impeller rotation direction.
      

2. 2. Routine Operation Monitoring

   • Periodically inspect the motor, impellers, and airflow components to prevent operational failures.

   • Monitor bearing temperature and vibration levels to maintain stable and efficient performance.
      

3. 3. Scheduled Maintenance

   • Replace motor grease every six months to ensure proper lubrication and longevity.

   • If equipped with a sound-absorbing muffler, replace the acoustic material every 6-12 months.

   • Conduct comprehensive inspections every six months, checking for wear and airflow efficiency.
      

4. 4. Storage and Preservation

   • When not in operation, the SDF(B) tunnel ventilation fan should be stored in a dry, well-ventilated environment to prevent moisture-related damage and corrosion.

The SDF(B) Series Counter-Rotating Tunnel Ventilation Fan is a high-performance solution for underground construction, offering efficient airflow management, energy savings, and long-term reliability for railway, highway, and hydro power tunnel ventilation applications.