Where stairways are fitted in a public space consisting
of only two decks, the following conditions should be met:
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.1 all levels are used for the same purpose;
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.2 the area of the opening between the lower and
upper part of the space should be at least 10% of the deck area between
the upper and lower part of the space;
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.3 the design should be such that persons within
the space should be generally aware, or could easily be made aware
of, a developing fire or other hazardous situation located within
that space;
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.4 sufficient means of escape are provided from
both levels of the space directly leading to an adjacent safe area
or compartment; and
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.5 the whole space is served by one section of
the sprinkler system.