Any engine benefits from having hot air exhausted and cooler fresh air admitted to the engine compartment. We have a blower that runs whenever the engine is operating that extracts and discharges hot air from the top area of the engine compartment and two static vents with ducting that admit cooler air to the lower area of the compartment. This arrangement also helps discharge fuel
and hot oil odors from the boat such that our accommodation has no "engine smell" which can be tough for those prone to sea-sickness.
"It is not so much for its beauty that the sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."