We have a 20-storey residential building, which will be naturally ventilated, so to meet IEQp1, naturally ventilated spaces shall be permanently open to the outside at a distance of 8 meters (25ft) of a wall or opening useful in roofs, the opening area must be at least 4% of the net occupiable floor area.
The question is:

Does this percentage should be constantly open to ensure ventilation, or is it sufficient that this percentage is only operable?