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Smoke vent to stair

Andy62
in Fire Risk Assessments

Featured Replies

I am of the opinion that in a two story single stair building with two flats on GF and two flats on FF, all with internal protected hallways, no smoke vent is required at the head of the stairway enclosure.

ADB clause 3.50 specifies 'Except in buildings that comply with Diagram 3.9,  the corridor or lobby next to each stair should have a smoke vent'.

Dia 3.9 specifies 'If the flats have protected entrance halls, the lobby between the common stair and flat entrance is not essential'.

The flats accord with Dia 3.9, therefore, no smoke vent is required because there is no lobby to install it in. The Stair enclosure only has a landing with flat entrance doors directly off it.

Any opinions would be appreciated?

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