Funny thing... I've got 45 yrs working on boats and yachts, mainly in the size category that they pretty much remain in the water.
In my business with engine intake its about keeping water out.
Turbo's and blowers on diesel engines consume a very large amount of air.
I've seen some decent U.S. built boats with the most idiotic air intakes/plenums that you think were actually designed to direct everything from seawater, rainwater and boat washing right into the engine compartment.
So such things are not surprising to me when purchasing a machine such as these from a relatively newcomer, and from China