The design of mechanical

The design of mechanical exhaust ventilators has to comply with D.6
H.2.6 A fan failure (monitoring of motor fan switching devices is sufficient) shall be alarmed on the
bridge.
H.2.7 Inlets for exhaust ducts are to be located within 450 mm above the vehicle deck. Outlets are to
be located in a safe position, having regard to sources of ignition near the outlets.
H.3 Closing appliances and ducts
H.3.1 Arrangements shall be provided to permit a rapid shutdown and effective closure of the ventilation
system from outside of the space in case of fire, taking into account the weather and sea conditions.

Access routes to the controls for closure of the ventilation system “permit a rapid shutdown” and adequately
“take into account the weather and sea conditions” if the routes:
 are clearly marked and at least 600 mm clear width;
 are provided with a single handrail or wire rope lifeline not less than 10 mm in diameter, supported
by stanchions not more than 10 m apart in way of any route which involves traversing a deck exposed
to weather; and
 are fitted with appropriate means of access (such as ladders or steps) to the closing devices of
ventilators located in high positions (i.e. 1.8 m and above).
Alternatively, remote closing and position indicator arrangements from the bridge or a fire control station
for those ventilator closures are acceptable.