02 · Ventilation & AC

Tunnel Ventilation

Heavy-duty longitudinal, transverse, and saccardo tunnel fans.

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Tunnel Ventilation — For indicative purposes only.

Fan typesJet, axial, centrifugal, Saccardo

CertificationAMCA 250 for tunnel duty

Temperature ratingF200 / F250 / F300 / F400

Manufacturer

Zitron

Applications

Where it is used

01Road tunnels and highway underpasses
02Metro running tunnels and station ventilation
03Rail freight tunnels
04Long utility and cable tunnels
05Airport apron and baggage tunnels
06Military and critical-infrastructure tunnels

Read the product brief

Flow Dynamics supplies tunnel ventilation fans for road, metro and infrastructure tunnels in the UAE and GCC. Road and metro tunnels need active ventilation both for daily air-quality management and for emergency smoke control. The range covers longitudinal jet fans mounted to the tunnel ceiling, transverse supply-and-extract fans connected to ductwork along the tunnel length, and Saccardo nozzles for portal injection. Products are built to AMCA 250 tunnel certification with motor classes rated for elevated temperature and for the corrosive, vibration-heavy tunnel environment.

How it works

Working principle

In longitudinal ventilation, a chain of ceiling-mounted jet fans pushes air along the tunnel length at 2–4 m/s under normal operation. During a fire, the system reverses or concentrates thrust to hold smoke back from the evacuation direction, a control strategy known as critical velocity. Transverse ventilation delivers fresh air through a supply duct along the tunnel length and extracts vitiated air through a parallel extract duct, giving uniform distribution independent of traffic direction. Saccardo nozzles inject a high-velocity jet at the tunnel portal to entrain and drive airflow without obstructing the tunnel bore.

Exploded component view of Tunnel Ventilation

What the team needs to review

These are indicative ranges from the current product record. Exact specifications are confirmed per project during selection.

01Operating duty
Share the required airflow or capacity, operating condition and expected schedule.
02Site arrangement
Provide the available drawings, connection points, installation position and service clearances.
03Project requirements
Include the consultant specification, material, control and approval requirements that apply.
04Quantity and delivery
Provide the project location, quantity and required delivery date.

Technical specifications

These are indicative ranges from the current product record. Exact specifications are confirmed per project during selection.

Fan types	Jet, axial, centrifugal, Saccardo
Certification	AMCA 250 for tunnel duty
Temperature rating	F200 / F250 / F300 / F400
Thrust per jet fan	600 – 2,500 N
Airflow (axial)	Up to 500,000 m³/h per unit
Construction	Marine-grade coatings, anti-vibration

Plan your enquiry

Start with the project information available.

Share the application, duty or airflow figures, drawings and any consultant specification available. The team will confirm what is needed to complete selection.

Common questions

01What certification do tunnel fans need?

Tunnel duty fans are built to AMCA 250 with temperature ratings from F200 to F400 depending on the emergency scenario, plus the corrosion and vibration specifications the tunnel environment demands.

02Longitudinal or transverse ventilation for my tunnel?

Tunnel length, gradient, traffic mode and the fire strategy decide the concept; jet-fan longitudinal systems suit most road tunnels while long or bi-directional bores may need transverse or Saccardo schemes. We support the concept selection with the manufacturer.

03Can you support the CFD and fire strategy submittal?

Send the required duty, site conditions, equipment schedule and any available drawings or consultant specification. We use these to prepare an equipment selection and the supporting technical documents.