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Ventilation
Natural Ventilation
FEDERAL LAW
183.630 - Standards for natural ventilation
(a) For the purpose of 183.620
“natural ventilation” means an airflow in
a compartment in a boat achieved by having:
(1) A supply opening or duct from the
atmosphere or from a ventilated compartment or from
a compartment that is open to the atmosphere; and
(2) An exhaust opening into another
ventilated compartment or an exhaust duct to the atmosphere.
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NATURAL VENTILATION SYSTEM
A natural ventilation system must have two elements:
- a supply opening or a duct
- and an exhaust opening or duct.
NOTE:
An exhaust duct may serve for both the natural ventilation
system and the powered ventilation system.
SUPPLY
The supply opening or duct may take air in from
any of the following: See Figure
11.
- The Atmosphere:
An opening on the outside surface of the boat. It may be
fitted with a cowl, louver, clamshell or other suitable
ventilation terminal fitting.
- Ventilated Compartment:
A supply opening or duct may be installed to take in air
from a compartment that is required to be ventilated, provided
the supply for that ventilated compartment is on the exterior
surface of the boat. See requirements for determining which
compartments need to be ventilated in 183.610(a)
and 183.620(a).
- Compartments Open to the Atmosphere:
A supply opening or duct may be installed totake air in
from a compartment that qualifies as open to the atmosphere
as described in 183.605.
EXHAUST
The exhaust opening or duct may expel air into
any of the following:
- The Atmosphere:
If the exhaust discharge point is directly into the atmosphere,
there must be a duct from the air and/or vapors intake point
to the exhaust discharge point, which is usually at the
deck or hull side near the deck.
- Ventilated Compartment:
An exhaust opening may be located in a bulkhead or other
structure that separates a ventilated compartment from the
compartment in which the natural ventilated system is being
considered.
The ventilated compartment into which the exhaust
opening discharges may not be the same ventilated compartment
that contains a supply opening or duct for the compartment
being considered.
Air intake openings inside a compartment should
be separated from the exhaust duct openings inside the compartment
by 24 inches, compartment dimensions permitting.
FIGURE
11 - Natural Ventilation and Exhaust Options
TO COMPLY WITH THE LAW
One of the following must be answered
YES:
- Is the supply opening or duct from
the atmosphere, a ventilated compartment with intake
on the exterior surface of the boat or a compartment
that is open to the atmosphere?
And, one of the following must be answered
YES:
- Is there an exhaust opening into a
ventilated compartment other than that in which the
supply is located, or is there an exhaust duct to
the atmosphere?
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