• 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. 

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The SDF(C) Series Counter-Rotating Tunnel Ventilation Fan is built for demanding underground projects, ensuring optimal airflow management, high-pressure ventilation, and noise reduction. This heavy-duty ventilation system is widely used in railway tunnels, highway tunnels, hydroelectric construction, and other underground engineering projects.
 

Key Features of SDF(C) Series Tunnel Fan

• Counter-rotating dual impeller system enhances airflow stability and aerodynamic efficiency.

• Multi-speed motor technology, providing customized airflow options for energy savings.

• Engineered for high-altitude tunnel construction, ensuring consistent performance in extreme conditions.

• Durable steel impellers treated with arc flame spraying, offering enhanced strength and corrosion resistance.

• Built-in silencers at inlet and outlet, complying with JB/T8690 industrial noise control standards.

• Double-layer welded housing with soundproofing glass wool lining, significantly reducing operational noise.

• Compact, space-saving structure, with long-distance air supply capabilities for deep tunnel projects.

Installation and Operating Conditions

• The air duct diameter must be larger than the impeller diameter for efficient ventilation.

• Use flexible air ducts with an air leakage rate below 1% to ensure optimal airflow efficiency.

• The fan outlet is equipped with a direct connector, allowing for seamless integration with tunnel ventilation systems.

• Designed to operate effectively in both standard and high-altitude environments, ensuring reliable airflow management.

Use and Maintenance Guidelines

1. 1. Pre-Startup Checks
   • Inspect all bolts, fasteners, and structural integrity before operation.
   • Confirm impeller rotation is smooth with no abnormal resistance or noise.
   • Conduct a test run to verify correct rotation direction of the impellers.
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2. 2. Operational Monitoring
   • Regularly examine the system for loose connections, excessive vibrations, or unusual sounds.
   • Monitor motor heat levels and bearing conditions to prevent overheating.
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3. 3. Routine Maintenance
   • Lubricate motor bearings every six months, maintaining proper grease levels.
   • If equipped with a soundproof muffler, replace noise-absorbing material every 6-12 months.
   • Perform biannual inspections, checking for wear and component efficiency.
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4. 4. Storage and Preservation
   • When not in use, store the tunnel ventilation fan in a dry, well-ventilated area to prevent moisture damage and corrosion.

The SDF(C) Series Counter-Rotating Tunnel Ventilation Fan is an efficient, energy-saving solution for underground tunnel construction, offering superior airflow performance, adjustable ventilation speeds, and long-distance air supply capabilities.