Key points
- Underground car parks need day-to-day ventilation for exhaust fumes and smoke clearance in a fire.
- Ducted systems use a duct network and large axial extract fans. Jet-fan systems push air and smoke towards extract points, reducing ductwork.
| Item | Ducted axial | Jet fans |
|---|---|---|
| Ductwork | Extensive | Minimal |
| Headroom | Reduced by ducts | Better |
| Design | Conventional calculations | Usually CFD modelling |
| Fire rating | F300 / F400 fans | F300 / F400 jet fans |
From the NOVOVENT catalogue: JET PIROS / JET PIROS WINDER jet fans and AXITUB PIROS axial smoke fans (F400).
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