Ventilation & Drainage Systems; Engine Compartment Ventilation; Engine Ventilation System Maintenance; Cabin Ventilation - Four winns Horizon 210 Owner's Manual

VENTILATION & DRAINAGE SYSTEMS
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ENGINE COMPARTMENT VENTILATION

All Four Winns® stern drive models are equipped with
engine compartment ventilation. This system is designed
to meet or exceed the requirements (in effect at the time
of manufacture) of the U.S. Coast Guard, the National
Marine Manufacturers Association, and the American
Boat and Yacht Council.
A. Gravity Ventilation System
This system includes air intake and exhaust components.
The exhaust ducting reaches to the lower bilge area.
This provides adequate air movement while underway
and during bilge blower operation.
B. Forced Air Ventilation
All Four Winns® models except outboards are equipped
with an electric bilge blower. The bilge blower provides
the ventilation required prior to starting the engines and
while at idle. See Section H Electrical Systems for blower
operation instructions.
Gasoline vapors can explode resulting in in-
jury or death. Before starting the engine, check
the engine compartment bilge for gasoline or
vapors, and operate blower for four (4) minutes,
and verify blower operation. Run blower when
vessel is operating below cruising speed. AL-
WAYS operate the bilge blower while the en-
gines are at idle.
NOTICE
A Gas Vapor Detector is a monitor which will
alert the operator of an accumulation of gaso-
line fumes in the engine compartment. It is op-
tional only on larger models but can be installed
by your Four Winns® dealer. DO NOT rely solely
on detectors or similar equipment. ALWAYS
conduct a physical inspection of the engine
compartment.
Horizon & Sundowner
Owner’s Manual
06/00
C. Engine Ventilation System Maintenance
Periodic inspection and cleaning of the ventilation ducts
is necessary to ensure adequate air circulation. A buildup
of leaves, twigs, or other debris can severely reduce
ventilation. Be sure bilge water does not accumulate to
a level that would obstruct the ventilation ducts.
Blower operation can be tested by placing a hand over
the vents. DO NOT rely on the sound of the blower. Be
sure a substantial amount of air is being exhausted by
the bilge blower. Check the bilge blower system often,
preferably before each cruise.
Should blower noise and vibration be excessive, loos-
ening the bilge blower mounting screws and then tight-
ening evenly usually reduces noise considerably.
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CABIN VENTILATION

Deck hatches on Four Winns® Sundowner models are
designed to open and provide adequate ventilation in
the cabin berth area.
Failure to properly ventilate the boat while the
engine is operating may permit carbon monox-
ide to accumulate inside of the cabin. Refer to
Section E-2 Engine Exhaust and Section B-2
Carbon Monoxide for additional information.
Screens for the forward deck hatches are available for
all Four Winns® boats. The screens are removable and
must be stored properly when not in use.
NOTICE
Be sure deck hatches are secured while under-
way. Damage to the hatch may result. Store
screens in a safe place to prevent damage.
Deck hatches are made of plexiglass and can be
cleaned with automotive glass cleaners or dishwashing
soap and water. Ensure that a clean cloth is used to
prevent scratching the plexiglass.
Section K
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