Natural ADB Smoke Shaft


A natural shaft is a prescriptive solution aligned with Approved Document B and BS 9991.

Smoke is extracted from common escape corridors via a 1.0sq/m geometric EN12101-8 smoke vent into a 1.5 sq/m geometric area smoke shaft and out to atmosphere at the head of the shaft via a roof mounted 0.7 aerodynamic sq/m EN12101-2 smoke vent (SHEV).

The escape stair contains a 0.7 aerodynamic sq/m SHEV at the head to exhaust any smoke that follows the occupant from the corridor and provides replacement air for the shaft system.

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