21A.15.1 Where machinery spaces are adjacent to
accommodation spaces, the boundaries should be designed to be gas
tight. The requirement to be gas-tight is taken to mean that bulkheads
should be so constructed as to prevent ingress of water and noxious
gases into adjacent cabins as far as is reasonable and practicable
to do so.
21A.15.2 Machinery space boundaries must retain
any liquids which may leak from the equipment within the machinery
space.