Technical Booklet E Fire Safety·Page 46·2.34D
Corridor/lobby vents in multiple stair buildings over 11 m
In multiple stair buildings where any storey is over 11 m above ground level, corridor/lobby vents must activate automatically like single stair building guidance requires.
In a multiple stair building with a storey over 11 m above ground level, the corridor/lobby vents should activate automatically, as per the guidance for a single stair building.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet E - Fire Safety.pdf