Engine room, ventilation and sound proofing
109
1
5
3
4
2
1.
Engine air filter
2.
Inlet duct, engine room
3.
Ventilation
4.
Water trap
5.
Suction fan
Location of ventilators
and air intakes
NOTE! Air intakes or outlet holes must never be in-
stalled in the transom. The air in this area is mixed
with water and exhausts and must therefore never be
allowed to enter the boat.
Function of air intakes
Air intakes and outlets must function well, even in bad
weather, and must therefore have efficient water
traps. Soundproofing must usually be built in.
The air intake and outlet should be placed as far away
from each other as possible so that a good through-
flow is obtained.
If the intake and outlet are too close, the air can recir-
culate resulting in poor ventilation.
Location of air ducts
The channels or ducts for the engine air supply should
be routed up as close as possible to the air filters, but
with a minimum distance of 20–30 cm (8–12"), to defi-
nitely prevent water from entering the engine. See fig-
ures.
Example of how the inlet and outlet air ducts can be
installed in pleasure boats and similar hulls using die-
sel engines.
For diesel engines the incoming ventilation air duct
should open out low down in the engine room, but not
so low that any bilge water can block the air supply.
The outlet ducts should be located diagonally across
on the other side of the engine.
All channels and ducts must be routed so that the
least possible flow resistance is obtained. The bends
must not be sharp, but softly rounded. The smallest
radius is twice the diameter. Restrictions must al-
ways be avoided.
The ducts should be cut obliquely at the ends to get
the best flow.
In certain countries there are regulations in this re-
spect, which must be followed.
Should it not be possible to arrange the drainage, the
hoses can be bent slightly upwards, as a swan’s
neck, in order to prevent sea-water from penetrating to
the engine compartment. Remember to build the en-
gine compartment as roomy as possible to allow the
servicing of the engine.
Содержание KAMD300
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