Location of ventilators and air inlets
NOTICE!
Air inlets and outlets may never be located
on the transom. Air in this area mixes with water and
exhaust fumes, and must never be allowed into the
boat.
Air inlet function
Air inlets and outlets must function well even in bad
weather and must therefore have efficient water traps.
For the most part noise insulation must be built in.
Air inlets and outlets must be located as far away from
each other as possible so that an effective through flow
is achieved.
If inlets and outlets are too close to each other air is
able to recirculate, which will provide inadequate ven-
tilation.
Location of air ducts
Ducts or pipes for engine air supply must be run to a
place as close to the air filter as possible, but with a
minimum distance of 20–30 cm (8–12") in order to def-
initely prevent water from entering the engine; refer to
the adjacent figure.
The inlet ventilation duct for diesel engines must be led
in far down into the engine compartment, but not so far
down that any bilge water is able to block air supply.
The outlet duct must be located diametrically opposite
on the other side of the engine.
All ducts and pipes must be run such that there is the
least possible flow resistance. Bends may not be
sharp, but must be moderately rounded. The minimum
radius is double the diameter.
Obstacles or constric-
tions must always be avoided
.
The ducts must be cut obliquely at the ends to provide
best flow.
Always take any llocal regulations into consideration.
If it is not possible to arrange drainage, ventilation
hoses must be bent upwards somewhat in order to
form a gooseneck that prevents seawater forcing its
way into the engine compartment. Remember to build
the engine compartment as spaciously as possible to
facilitate engine service.
1
2
3
4
5
P0004733
1
Engine air filter
2
Inlet duct, engine compartment
3
Outlet
4
Water trap
5
Extraction fan
P0004734
Arrangement and Planning, Engine Room
47704162 10-2014 © AB VOLVO PENTA
29
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