(a) Sleeping accommodations must be divided into rooms, no one of which may berth more than six persons. The purpose for which each space is to be used and the number of persons it may accommodate, must be marked outside the space.

(b) Each room must be of such size that there is at least 1.8 square meters (20 square feet) of deck area and a volume of at least 4.2 cubic meters (150 cubic feet) for each person accommodated. In measuring sleeping quarters, any furnishings contained therein are not to be deducted from the total volume or from the deck area.