A natural shaft is a prescriptive, code compliant solution aligned to 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 1.0 sq/m geometric free area EN12101-2 AOV (NSHEV).
The escape stair contains a 0.7 aerodynamic sq/m NSHEV 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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