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Ventilation
Natural Ventilation
FEDERAL LAW
183.620 - Natural ventilation system
(a) Except for compartments open to the
atmosphere, a natural ventilation system that meets
the requirements of Sec. 183.630 must be provided for
each compartment in a boat that:
(2) Has openings between it and a compartment
that requires ventilation, where the aggregate area
of those openings exceeds 2 percent of the area between
the compartments, except as provided in paragraph
(c) of this section;
(c) An accommodation compartment above
a compartment requiring ventilation that is separated
from the compartment requiring ventilation by a deck
or other structure is excepted from paragraph (a)(2)
of this section. |
OPEN TO THE ATMOSPHERE
Compartments that are open to the atmosphere
do not require additional ventilation. Long narrow spaces
formed by side panels or accommodation floors should have
openings at each end or along the sides if they are to be
considered open to the atmosphere.
ADJOINING COMPARTMENTS - The 2% Rule
Natural ventilation for a compartment adjacent
to a compartment requiring ventilation is needed if the total
area of all openings between these compartments is more than
2% of the separating structure. If this area is equal to or
less than 2%, natural ventilation is not needed for that adjacent
compartment.
EXCEPTION: Compartments used
for accommodations do not require ventilation if:
- the accommodation is above the compartment
requiring ventilation; and
- the accommodation compartment is separated
from the compartment requiring ventilation by a deck or
other structure.
Accommodation compartments
are designed for storage spaces and for living spaces for
persons aboard the boat. Examples of specific uses of accommodation
compartments include: staterooms, heads (bathrooms), galley,
pilot house, navigation, work area and other similar people
oriented uses. The uses contrast with engine and fuel tank
compartments.
TO COMPLY WITH THE LAW
- Is the adjoining compartment requiring
ventilation separated by a bulkhead or otherstructure
where the total area of all openings is more than
2% of the area of said bulkhead or other structure?
If YES, natural ventilation is required
for said adjoining compartment except as indicated
below.
- Is the adjoining compartment vented
to a compartment requiring ventilation?
If YES, then no additional ventilation
is required.
- Is the adjoining compartment:
- an accommodation compartment?
- above the compartment requiring ventilation?
- separated by a deck or other structure?
If YES to all items, then natural ventilation
is not required.
- Is the adjoining compartment to a
compartment requiring ventilation, separated by a
bulkhead or other structure with the total area of
openings equal to or less than 2% of the area of the
bulkhead or other structure?
If YES, natural ventilation is not required.
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