Heavy-Duty Tunnel Jet Fan (Unidirectional & Reversible Series)

Jet fans are primarily deployed in longitudinal ventilation systems for highway and railway tunnels. Suspended directly from the ceiling or mounted along the sidewalls of the tunnel, the fans do not occupy traffic clearance or require dedicated ventilation ducts. This significantly lowers civil construction costs, offering a highly economical ventilation solution.During operation, the fan generates high thrust from its input power. A portion of the total airflow moving through the tunnel is drawn into the fan, energized by the high-speed rotating impeller, and discharged at high velocity through the outlet nozzle. Based on the principle of impulse momentum transfer, this high-velocity air jet transfers energy to the surrounding air inside the tunnel, driving the entire air mass forward. As the air velocity decays to a predetermined threshold, the next downstream group of jet fans engages. This relay mechanism enables continuous fresh air intake from the tunnel entrance and effective exhaust of polluted air through the exit portal.

The SDS Series Tunnel Jet Fan assembly typically consists of the following key components: discharge nozzles, silencers, flow straighteners, fan casing section, and electric motor.

Streamlined nozzles optimize the flow field for high operational efficiency. Silencers are equipped on both ends of the fan casing section, featuring perforated inner cylinders filled with specialized waterproof acoustic absorption material. The fan casing section consists of rolled and welded steel plates with flanges at both ends for convenient connection to the silencers, housing the internal motor and impeller where positioning flanges ensure consistent blade tip clearance, while the airfoil blades are pressure die-cast from aluminum alloy. Near-streamlined front and rear flow straighteners further optimize the flow field to maintain high running efficiency. The motor operates at a rated voltage of 380V with Class F insulation and IP54 protection, accompanied by an external junction box mounted on the casing for straightforward cable connection.

For additional specification sheets, please contact our sales team.