One my ACE 29.3 I have three vents two of them have the Maxx Air type covers. The other vent in the bathroom is just a cover over the fan. I do not see anyway the rain will come through the maxx air vents. As they are designed so you can have your vent open during a rain storm. If you do not have these and you have the standard type cover, yes rain will come in when they are open.
After re-reading your post I am thinking you are talking about the vent fan over the stove. If so your best is to caulk around the outside cover.
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