wrote in message
link.net...
Actually Bill, you are only half right here.

The E/R blower does move the air out of the engine compartment, but that
air
must come from someplace.

Whether the boat has a forced air intake or not isn't the question as the
exhaust blower will cause a forced air intake just from the pressure of it
operating.

Remember, it can't take air out that does not exist, and it can't
continually take air out if there is no supply.

A continuous duty blower, in any engine compartment, works to ensure the
compartment temperatures do not get too high... As we all know, too high
of
temperatures used when mixing a combustible fuel with the surrounding air
for engine ingestion can cause the engine to vapor lock and therefore
cease
operation until such time as the engine compartment can be cooled for
proper
temperature mixing.

"Calif Bill" wrote in message
nk.net...


Neither is your or Shen's. A E/R blower sucks the air out. Not blow
air
in. Therefore there should be at the most a slightly negative pressure.





That Sucker fan, does not cause forced air into the bilge, is makes a
negative pressure environment where the air from the intake line, trys to
fill that negative area. If you had a blower in the intake, then there
would be forced air. And the only time I force air in to my engine room is
during the winter, as I install a solar powered Nicro vent over the intake
to keep the humidity down, and dry out the rain water that wants to collect
in the bilge.