All engine exhaust systems should be adequate to assure
the correct functioning of the machinery and that safe operation of
the craft is not hazarded. Exhaust systems should be so arranged as
to minimize the intake of exhaust gases into manned spaces, air conditioning
systems, and engine intakes. Exhaust systems should not in general
discharge into lift system intakes. Exhaust discharging through the
hull in the vicinity of the waterline should befitted with shut-off
valves on the shell unless alternative arrangements have been made
to ensure that the risk of flooding of the space is minimized.