G'Day GI,
In general there is nothing wrong with ventilating thusly. My only concern is that many
solar vents don't do well with green
water over them, and many boats get the forward bits of the
deck inundated regularly... don't know about yours.
So, if your
anchor locker is open into the main part of the
hull as is implied in your description, you risk getting
water down there if the vent
leaks.
May not be a realistic worry in your case, but something to think about.
Cheers,
Jim