Mercury 25 EFI FourStroke User Manual page 46

Carbon monoxide poisoning can lead to unconsciousness,
brain damage, or death. Keep the boat well ventilated while at
rest or underway and avoid prolonged exposure to carbon
monoxide.
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.
GENERAL INFORMATION
WARNING
!
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