Jet-fan systems effectively control smoke in car parks by creating directed airflows that transport smoke from one point to another, similar to how longitudinal ventilation works in tunnels. These systems offer cost-effectiveness and simplicity by eliminating ductwork while providing powerful smoke management capabilities when properly designed and understood.
• Jet Fans create momentum transfer through air entrainment rather than directly moving smoke • Two distinct operational modes exist: smoke clearance (reducing thermal stress) and smoke control (maintaining clear firefighter access) • Systems require careful balancing of extraction capacity with Jet Fan thrust force • Optimal design typically requires CFD modeling followed by hot smoke testing for verification • Jet Fan activation timing presents challenges for evacuation - usually delayed until occupants exit • Systems excel in tunnel-like geometries but struggle with complex layouts (the "Tetris rule") • Particularly effective against heavier-than-air gases like LPG or EV battery fire emissions • European standards now available through EN 12101 family for design guidance
If you need design assistance with Jet Fan systems for your projects, email me directly at w.wegrzynski@itb.pl.
Thank you to the SFPE for recognizing me with the 2025 SFPE Fire Safety Engineering Award! Huge thanks to YOU for being a part of this, and big thanks to the OFR for supporting me over the years.
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