In one minute an engine will use and exhaust roughly the same amount of air as would be found in a small engine room (14 x 12 x 5). If it is not provided a source of air it will create it own by pulling it in from vent openings, hatchways, port holes, anyway it can. As many have said before, nature abhors a vacum. It will even pull air through broken electrical conduits, old piping, and small cracks in your bulkheads many places you probably do not want salt ladden air moving.
For those of you that do not think supplying more than ample air to you engine is a critically important issue, I would assume all of your engines are naturally aspirated and no turbos are used.
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