The Principle of Impulse Ventilation
Traditional ducted ventilation in underground car parks and tunnels requires massive structural overhead. Jet fans eliminate ductwork entirely using impulse ventilation. By discharging a high-velocity stream of air (up to 30 m/s), the jet fan entrains surrounding ambient air through momentum transfer, moving a total air mass far greater than what passes through the fan itself.
Thrust Ratings and Acoustic Attenuation
Unlike standard axial fans measured in CFM, jet fans are specified by their Thrust rating (measured in Newtons). Because they operate at extreme velocities, aerodynamic noise is a critical engineering constraint. Commercial jet fans incorporate dual cylindrical silencers (upstream and downstream) lined with acoustically transparent perforated metal and mineral wool to meet stringent urban noise criteria.