Free Vent Area Calculation
In order to clear the smoke at the correct rate, the recommended free vent area you need to achieve from your window or windows is:
Stairwell Windows: 1mtr square free vent area at 90 degrees from the opening vent.
Lobby Windows: 1.5mtr square free vent area at 90 degrees from the opening vent.
Windows should be bottom hinged & open out or side hinged open out and ideally above the head of the door to clear the smoke above head height.
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