VENTILATION
APPLIES TO:
ALL MOTORBOATS OR MOTOR VESSELS, EXCEPT OPEN BOATS,
THAT USE FUEL WITH A FLASHPOINT 110 FAHRENHEIT DEGREES
OR LESS (GASOLINE).
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REQUIREMENTS FOR UNINSPECTED COMMERCIAL FISHING VESSELS:
Bilges to every engine and fuel tank compartment shall have at least
two ventilator ducts, fitted with cowls or their equivalents, for the
efficient removal of explosive or flammable gases.
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STANDARD:
-At least one exhaust duct shall be installed so as to extend from the
open atmosphere to the lower portion of the bilge.
-At least one intake duct shall be installed so as to extend to a
point at least midway to the bilge or at least below the level of
the carburetor intake.
-The cowls shall be located and trimmed for maximum effectiveness and
in such a manner as to prevent displaced fumes from being
recirculated.
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INSTRUCTORS NOTES:
The following is a list of Ventilation requirements for recreational
vessels and is supplied as a guide. Commercial Fishing vessels must
comply with the requirement for natural ventilation only; unless it
was manufactured as a production recreational boat.
Date of
Type of
Ventilation
Notes
Manufacture
25APR40-31JUL78
Natural(Req)
Each fuel and engine compartment
01AUG78-31JUL80
Natural(Req)
Each fuel and engine compartment
Power(Opt)
and closed spaces where
explosive or flammable gases or
vapors may flow.
On/After 01AUG80
Power
Each engine compartment.
(required
each permanent fuel tank
for rec.
compartment with an electrical
boats)
source.
Warning label at engine switch.
Natural ventilation: Intake cowl face forward, duct extend
below level of carburetor. Exhaust cowl face aft, duct
extend to lower portion of the bilge, below starter
level. Cowls trimmed so as not to recirculate fumes.
After 06 March, 1987, cowls may face either direction.
Power ventilation: Motor must work, ducting intact and
discharging adequate volumes of air.
The following warning label at engine switch should read:
Warning:
Gasoline vapors can explode. Before starting engine,
operate blower for at least 4 minutes and check
engine compartment for gasoline vapor.
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REFERENCES: 46 CFR 25.40-1, 33 CFR 183, Rec. Boat Fed. Requirements
pamphlet
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