Tunnel Jet Fans
Product overview
Longitudinal tunnel-ventilation fans engineered around required jet thrust, air velocity, tunnel geometry and operating strategy. RAFAVENT tunnel jet-fan construction is available from Ø560 to a maximum family size of Ø1400.
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Required installed thrust in newtons, traffic direction, tunnel cross-section, spacing and permissible air velocity.
Ceiling clearance, wall proximity, silencers, mounting cradle, obstructions and cross-flow can reduce effective installed thrust.
Unidirectional or reversible airflow, normal ventilation, emergency strategy, VFD control and redundancy philosophy.
Nominal thrust is calculated from air momentum at standard-density air (approximately 1.2 kg/m³). Use installed-thrust correction factors during detailed design.
Six-point speed-law presentation at 0%, 25%, 50%, 75%, 90% and 100%: airflow varies approximately with speed, thrust with speed² and absorbed power with speed³. Displayed thrust is rounded to the nearest newton and power to 0.1 kW. Values are preliminary and exclude installation corrections.
RAFAVENT has developed a pressure-loaded Ø1400 tunnel axial arrangement with inlet/outlet silencers and downstream guide vanes. This reference is distinct from the generic free-jet thrust ratings above.
Rolled, flanged heavy-gauge steel casing
Project-specific corrosion-protection coating
Aerodynamic impeller with adjustable design pitch
External terminal box and protected cable routing
Inlet and outlet attenuators sized to the duty
Mounting cradle, feet or ceiling suspension arrangement