If a space is divided by partial bulkheads into two (or
more) smaller areas such that they form enclosed spaces, then the
enclosed spaces should be surrounded by bulkheads and decks in accordance
with tables 7.4-1 and 7.4-2, as applicable. However, if the separating
bulkheads of such spaces are at least 30% open, then the spaces may
be considered as the same space.