CIBSE Guide E | Ch. 10 | Eq. 10.12

Limiting average air velocity for opposed air flow | Room of fire origin to corridor

Limiting average air velocity where opposed air flow is used to stop smoke spread from an adjoining room into a corridor

Reference

CIBSE (Chartered Institution of Building Services Engineers), 2019. CIBSE Guide E: Fire Safety Engineering. 4th edn. London: CIBSE.

Equations

v_e = K \space \frac{g \space Q}{w \space \rho \space c \space T} ^ {1/3}

Constant ( K )

Gravity acceleration ( g ) — m/s^2

Heat Release Rate ( Q ) — kW

Corridor width ( w ) — m

Density of upstream air ( \rho ) — kg/m^3

Specific heat of downstrean gases ( c ) — kJ/kgK

Temperature of the downstream mixture of air and smoke ( T ) — K