Tunnel Ventilation Fans are high-capacity industrial axial fans engineered specifically for underground air supply, vehicle exhaust control, and emergency smoke extraction.
They handle high static pressure drops over long duct lines and maintain stable airflow velocity under varying underground resistance conditions.
Technical Specifications
|
Parameter |
SDF Construction |
SDS Tunnel |
|
Application |
Duct ventilation |
Jet ventilation |
|
Diameter |
400–1,600 mm |
630–1,600 mm |
|
Airflow |
3.0–85.0 m³/s |
8.0–65.0 m³/s |
|
Static Pressure |
300–3,500 Pa |
- |
|
Thrust |
- |
150–2,500 N |
|
Motor Power |
4–200 kW |
7.5–110 kW |
|
Speed |
980–2,900 rpm |
980–1,450 rpm |
|
Voltage |
380–480 V |
380–480 V |
|
Airflow Direction |
Unidirectional |
Reversible options |
|
Protection |
IP55 / IP65 |
IP55 / IP65 |
|
Temperature |
-20°C to +50°C |
-20°C to +50°C |
|
Noise |
≤88 dB(A) @ 3 m |
≤78 dB(A) @ 3 m |
|
Balancing |
ISO 21940-11 G2.5 |
ISO 21940-11 G2.5 |
Performance & Duty-Point Selection
SDF Duct Ventilation
SDF fans supply or exhaust air through flexible PVC/PE ducts for excavation-face ventilation, dust dilution, blasting-fume removal, and fresh-air delivery. Selection is based on the required airflow and static pressure after accounting for duct friction, leakage, fittings, and tunnel resistance.
SDS Jet Ventilation
SDS jet fans generate axial thrust directly within the tunnel to move and mix air without a continuous ventilation duct. Selection is based on required thrust, tunnel cross-section, fan spacing, airflow direction, and reversible operation requirements.
Motor & Drive
Direct Drive: The impeller is directly coupled to the motor, eliminating belts and pulleys and reducing the number of mechanical transmission components.
Variable Speed: VFD-compatible configurations allow fan speed to be adjusted according to the required ventilation duty point, operating conditions, or tunnel control strategy.
Continuous Duty: Motor configurations can be specified for continuous S1 operation, with motor protection and enclosu
Impeller Design
Impeller Construction: Die-cast aluminum or high-strength steel impellers provide aerodynamic efficiency and structural strength.
Adjustable Blade Pitch: Blade pitch can be configured during fan setup to match the required airflow and static-pressure duty point. Final blade-angle settings are determined according to the selected fan model and performance requirements.
Reversible Operation: Reversible SDS configurations use blade and motor arrangements designed for bidirectional airflow. Forward and reverse thrust performance should be verified against the selected model's performance data.
Casing & Protection
Casing Protection: Carbon steel housings are treated with hot-dip galvanizing or heavy-duty epoxy powder coating systems to resist dampness, dust, and continuous industrial exposure.
Flange & Connection Design: Housing flanges can be manufactured with specified bolt-hole patterns and connection dimensions for flexible ducting, silencers, or other ventilation-system interfaces.
Structural Shell Reinforcement: Welded stiffening rings can be incorporated into the casing to increase structural rigidity and limit casing deformation under specified pressure and duct-loading conditions.
Mounting & Installation
Installation & Alignment: Fan mounting position, support structure, flange orientation, access clearance, and duct alignment should be confirmed before fabrication. Mounting brackets and support interfaces can be configured according to the tunnel structure and installation method.
Duct Connections: SDF fans can be supplied with flange or clamp-type connections for flexible PVC/PE ventilation ducts. Connection dimensions should be confirmed according to the selected duct diameter and installation arrangement.
Clearance: SDS fan dimensions and mounting arrangements can be configured according to required tunnel clearance and vehicle-access conditions.
Documentation: GA drawings, wiring diagrams, mounting details, and CAD models are available.
Testing & Compliance
Factory Testing: Each fan is tested for motor insulation, running current, impeller balance, and vibration.
Management Certification: The factory is certified to ISO 9001, ISO 14001, and ISO 45001 standards.
Independent Audit: TÜV Rheinland has independently audited the factory and its operations.
Documentation: Available documentation may include inspection reports, motor test data, general arrangement drawings, wiring diagrams, material certificates, and other project-specific documents.
FAQ
Q: Are fire-rated or smoke-extraction configurations available?
A: Standard SDF and SDS fans are rated for the specified operating temperature range and are not automatically fire-rated. Fire-rated or smoke-extraction configurations require separate technical evaluation and applicable certification based on the required temperature and operating duration.
Q: What data is needed for a quotation?
A: For SDF: airflow, static pressure, duct size, and resistance. For SDS: tunnel size, thrust, and reversibility. Quotations usually take 3–5 working days.
Q: Are spare parts available for older models?
A: Yes. Parts are identified by the fan model and serial number. Original order and nameplate details are recommended.
Q: Can you supply multiple fans for one tunnel project?
A: Yes. Multiple SDF or SDS fans can be selected and configured according to the ventilation layout, individual duty points, tunnel dimensions, and installation requirements.
Q: What is the lead time?
A: Standard SDF units require 25–35 days. Reversible SDS units and custom voltage or IP65 configurations require 40–55 days.
Q: Are factory testing reports provided?
A: Yes. Reports cover insulation resistance, running current, impeller balance, and vibration. Witness testing is available upon request.
Q: Can mounting and duct connections be customized?
A: Yes. Brackets, flange patterns, and connection profiles can be adapted to existing structures if the duty point remains within the standard range.
Q: What are the warranty and claim procedures?
A: Fan and motor coverage follow the sales contract and may differ. Claims can be handled remotely using photos, videos, and operating data.
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