SDS Series / Tunnel Longitudinal Ventilation
SDS Tunnel Jet Fan
SDS tunnel jet fans are designed for longitudinal airflow control in road tunnels, railway tunnels, metro tunnels and other underground transport passages. The series includes unidirectional SDS(K) and reversible SDS(R) configurations for normal ventilation, airflow management and project-specific emergency ventilation requirements.
Ventilation Method
Longitudinal Ventilation
Tunnel airflow organization
Fan Diameter
φ630–φ1600 mm
Current SDS range
Ventilation Forms
SDS(K) / SDS(R)
Unidirectional / reversible
Listed Thrust
46–3200 N
Listed performance data
01 / Engineering Overview
Tunnel Jet Fans for Longitudinal Airflow Control
SDS tunnel jet fans are intended for longitudinal ventilation systems in completed tunnels. Typical project environments include highway tunnels, railway tunnels, metro tunnels, urban underground passages and ventilation upgrade projects.
Unlike a ducted construction fan, a tunnel jet fan is selected primarily around the airflow strategy of the complete tunnel. Required thrust, tunnel geometry, target air velocity, installation spacing, operating direction and noise requirements all need to be reviewed together.
01 / THRUST
Drive Tunnel Air Movement
Thrust is a key performance value when reviewing jet fan duty in a longitudinal ventilation system.
02 / AIR VELOCITY
Meet the Tunnel Design Target
The required tunnel air velocity influences fan quantity, thrust demand and arrangement.
03 / OPERATING MODE
Select SDS(K) or SDS(R)
The tunnel ventilation strategy determines whether one-way or reversible fan operation is required.
02 / Working Principle
How a Tunnel Jet Fan Supports Longitudinal Ventilation
A jet fan produces a high-velocity axial air stream inside the tunnel. The moving jet transfers momentum to the surrounding tunnel air and helps establish airflow along the tunnel axis. Multiple fans can then be arranged according to the tunnel ventilation design.
STEP 01
Fan Generates Axial Jet
The fan accelerates air through the jet fan casing and discharges it along the tunnel direction.
STEP 02
Momentum Enters Tunnel Air
The jet interacts with surrounding air and contributes to the longitudinal movement of the tunnel air mass.
STEP 03
Multiple Fans Form the System
Fan quantity and spacing are determined from tunnel geometry, required airflow direction, operating mode and target air velocity.
A jet fan should therefore not be selected only from motor power or diameter. The complete tunnel ventilation duty must be considered.
03 / Ventilation Forms
SDS(K) and SDS(R) Tunnel Jet Fan Configurations
The SDS range includes unidirectional and reversible configurations. The correct choice depends on the required airflow direction and the tunnel operating strategy.
TYPE
DIRECTION
TYPICAL DUTY
SELECTION NOTE
SDS(K)
Unidirectional
Longitudinal ventilation where the designed airflow direction remains fixed
Use where one-way airflow operation is required
SDS(R)
Reversible
Bidirectional airflow control and emergency ventilation support
Forward / reverse operation; rated speed within 30 seconds
04 / Performance Data
SDS(K) Unidirectional Performance Data
The following SDS(K) data are reference performance ranges for the listed configurations. Final model selection should be confirmed against the actual tunnel ventilation duty.
MODEL
POLES
SPEED
r/min
r/min
BLADE ANGLE
AIRFLOW
m³/s
m³/s
THRUST
N
N
POWER
kW
kW
NOISE
dB(A)
dB(A)
SDS(K)-4K
2P
2900
a1–a4
2.0–3.9
46–102
0.75–2.2
63–73
SDS(K)-6K
2P
2900
a1–a4
4.1–6.5
102–245
2.2–7.5
71–75
SDS(K)-5.6K
2P
2900
a1–a4
6.0–8.4
175–340
4–11
67–73
SDS(K)-6.3K
2P
2900
a1–a5
9.5–14.0
250–660
5.5–18.5
71–75
SDS(K)-7.1K
2P
2900
a1–a5
12.0–17.5
320–680
7.5–22
71–75
SDS(K)-8K
4P
1470
a1–a5
10.0–16.5
210–520
4–11
63–71
SDS(K)-9K
4P
1470
a1–a5
16.0–24.0
380–850
7.5–22
70–75
SDS(K)-10K
4P
1470
a1–a6
21.0–30.0
640–1100
11–30
71–75
SDS(K)-11.2K
4P
1470
a1–a5
26.8–37.6
765–1600
15–45
69–75
SDS(K)-12.5K
4P
1470
a1–a6
36.0–50.0
855–2200
18.5–75
70–79
SDS(K)-14K
6P
980
a1–a5
31.5–46.5
730–1600
15–45
72–75
SDS(K)-16K
6P / 8P
980 / 740
a1–a6
40.0–68.0
1100–3200
22–90
69–75
SDS(R) Reversible Performance Data
SDS(R) is intended for projects requiring reversible airflow operation. The listed models provide reference ranges for airflow, thrust, motor power and noise.
MODEL
POLES
SPEED
r/min
r/min
BLADE ANGLE
AIRFLOW
m³/s
m³/s
THRUST
N
N
POWER
kW
kW
NOISE
dB(A)
dB(A)
SDS(R)-4B
2P
2900
a1–a4
2.0–3.9
46–102
0.75–2.2
63–73
SDS(R)-6K
2P
2900
a1–a4
4.1–6.5
102–245
2.2–7.5
71–75
SDS(R)-5.6K
2P
2900
a1–a4
6.0–8.4
175–340
4–11
67–73
SDS(R)-6.3K
2P
2900
a1–a5
9.5–14.0
250–660
5.5–18.5
71–75
SDS(R)-7.1K
2P
2900
a1–a5
12.0–17.5
320–680
7.5–22
71–75
SDS(R)-8K
4P
1470
a1–a5
10.0–16.5
210–520
4–11
63–71
SDS(R)-10K
4P
1470
a1–a6
21.0–30.0
640–1100
11–30
71–75
SDS(R)-12.5K
4P
1470
a1–a6
36.0–50.0
855–2200
18.5–75
70–79
SDS(R)-16K
6P / 8P
980 / 740
a1–a6
40.0–68.0
1100–3200
22–90
69–75
05 / Performance Guide
How to Read SDS Jet Fan Performance Data
The model table contains several values that should be reviewed together. A larger motor or higher airflow does not automatically mean that a model is the correct choice for a tunnel project.
01
Poles / Speed
Motor pole configuration and listed fan rotational speed.
02
Blade Angle
The listed angle positions correspond to different operating configurations within the model range.
03
Airflow
Volumetric airflow passing through the fan at the listed operating configuration.
04
Thrust
Axial force generated by the jet fan and a key value for longitudinal ventilation system design.
05
Power
Listed motor power range corresponding to the model configurations.
06
Noise
Reference noise range listed for the corresponding fan configurations.
Important: thrust is not the same selection concept as the pressure value normally used for a ducted ventilation fan. SDS should be reviewed as part of the longitudinal tunnel ventilation system.
06 / Selection Logic
How to Select an SDS Tunnel Jet Fan
A tunnel jet fan should be selected from the ventilation design requirement rather than from fan diameter alone. The following sequence is useful for preliminary project review.
01
Tunnel Geometry
Confirm tunnel length, cross-section, layout and available installation clearance.
02
Operating Requirement
Define normal ventilation duty, target airflow direction and any reversible operating requirement.
03
Air Velocity / Thrust
Provide the required tunnel air velocity or calculated thrust requirement from the ventilation design.
04
K or R Configuration
Choose unidirectional SDS(K) or reversible SDS(R) according to the airflow strategy.
05
Diameter / Clearance
Check the available tunnel space, fan diameter, mounting area and maintenance access.
06
Quantity / Spacing
Review the required number of jet fans and their installation spacing as part of the system design.
07
Final Checks
Confirm electrical supply, noise requirement, quantity and project-specific operating conditions.
07 / Installation Review
Installation Conditions Affect Jet Fan Selection
The fan model is only one part of the tunnel ventilation system. Installation location and available space should be reviewed before finalizing the selection.
Tunnel Clearance
Confirm available installation space around the fan and the tunnel traffic or equipment envelope.
Mounting Position
Review the intended mounting position and bracket arrangement before confirming overall fan size.
Fan Spacing
Spacing between jet fans should follow the tunnel ventilation design and the required airflow organization.
Maintenance Access
Leave suitable access for inspection and maintenance when reviewing the installation location.
Airflow Direction
Confirm the required discharge direction and whether reversible airflow operation is part of the project strategy.
Noise Requirement
Project noise limits should be reviewed together with the listed model noise ranges.
08 / Typical Applications
Tunnel Ventilation and Airflow Control Applications
01 / HIGHWAY
Highway Tunnel Ventilation
Supports longitudinal airflow control for vehicle exhaust dilution and tunnel air-quality management. Fan thrust and arrangement should follow the tunnel ventilation design.
02 / EMERGENCY
Emergency Airflow Control
Reversible SDS(R) configurations can be reviewed where the ventilation strategy requires bidirectional airflow control during emergency operating conditions.
03 / RAIL & METRO
Railway and Metro Tunnels
Suitable for underground transport tunnels where reliable longitudinal ventilation and controlled airflow direction are required.
04 / UPGRADE
Tunnel Ventilation Upgrade
For upgrade projects, existing installation space, fan position, required thrust, noise limits and the new operating strategy should be reviewed together.
09 / Product Boundary
SDS Tunnel Jet Fan vs. SDF Construction Tunnel Fan
SDS and SDF are both tunnel ventilation products, but they solve different ventilation tasks and should not be selected using the same criteria.
COMPARISON
SDS TUNNEL JET FAN
SDF TUNNEL VENTILATION FAN
Main Stage
Completed tunnel operation
Construction-stage ventilation
Ventilation Method
Longitudinal tunnel airflow
Ducted fresh-air supply
Core Selection
Thrust, air velocity, tunnel geometry and arrangement
Airflow, pressure and duct resistance
Typical Form
Jet fan
Axial duct fan
10 / FAQ
SDS Tunnel Jet Fan Questions
What is the main difference between SDS(K) and SDS(R)?
SDS(K) is unidirectional. SDS(R) is reversible and is used when the tunnel ventilation strategy requires airflow in both directions.
Can an SDS jet fan be selected only by diameter?
No. Fan diameter is only one input. Tunnel geometry, required air velocity, thrust, operating direction, fan quantity, spacing and noise requirements should also be reviewed.
Why is thrust important for a tunnel jet fan?
Thrust represents the axial force produced by the jet fan and is an important input when designing longitudinal tunnel airflow.
How many jet fans are required in a tunnel?
There is no fixed quantity based only on tunnel length. The required number depends on tunnel geometry, target air velocity, fan thrust, airflow strategy and installation arrangement.
Can SDS(R) be used for emergency airflow control?
SDS(R) provides reversible operation and can be reviewed for projects requiring bidirectional airflow or emergency ventilation control. Any specific fire or high-temperature performance requirement must be confirmed against the project specification and the final supplied configuration.
Does this page confirm a specific high-temperature rating?
No specific temperature-and-duration rating is stated here. If the project has a defined emergency temperature requirement, send the required temperature, operating duration and applicable project specification for confirmation.
What information should I send for selection?
Send the tunnel length and geometry, required air velocity or thrust, available installation space, required airflow direction, noise requirement, electrical supply and quantity.
Related Technical Pages
Continue the Tunnel Ventilation Selection
Product Route
Selection Focus
Thrust
Tunnel Geometry
Air Velocity
K / R Mode
Thrust
Tunnel Geometry
Air Velocity
K / R Mode
SDS Tunnel Jet Fan Selection
Send the Tunnel Ventilation Design Conditions.
Tunnel Geometry · Required Air Velocity / Thrust · Fan Diameter · SDS(K) / SDS(R) · Installation Clearance · Noise Requirement · Voltage / Frequency · Quantity
Manager Zhao
SHANDONG QIYUE FAN CO., LTD.
Industrial fan selection and export project support
Tel / WeChat / WhatsApp: +86 156 5330 5981
Email: sales@qiyuefan.com
Factory: Dongchen Industrial Park, Zhoucun District, Zibo, Shandong, China
Email: sales@qiyuefan.com
Factory: Dongchen Industrial Park, Zhoucun District, Zibo, Shandong, China
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