Mercury 15 FourStroke Manual page 33

GENERAL INFORMATION
GOOD VENTILATION
Ventilate passenger area, open side curtains, or forward hatches
to remove fumes.
Example of desired air flow through the boat
POOR VENTILATION
Under certain running and/or wind conditions, permanently
enclosed or canvas enclosed cabins or cockpits with insufficient
ventilation may draw in carbon monoxide. Install one or more
carbon monoxide detectors in your boat.
Although the occurrence is rare, on a very calm day, swimmers
and passengers in an enclosed area of a stationary boat that
contains or is near a running engine may be exposed to a
hazardous level of carbon monoxide.
WHILE BOAT IS STATIONARY
a
a - Running the engine when the boat is moored in a confined
space
b - Mooring close to another boat that has its engine running
b
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