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CIBSE Guide E | Ch. 10 | Eq. 10.11
Limiting average air velocity for opposed air flow | Fire in large volume to adjoining room
Limiting average air velocity where opposed air flow is used to stop smoke spread from large space to adjoining small space below the smoke layer interface
Reference
CIBSE (Chartered Institution of Building Services Engineers), 2019. CIBSE Guide E: Fire Safety Engineering. 4th edn. London: CIBSE.
Equations
v_e = 0.057 \space \frac{Q}{z} ^ {1/3}