Covering doors and especially windows serves two purposes: 1) keep windblown debris from breaking in, and 2) keeping high winds out.

If hurricane force winds enter most buildings, they have enough force to create their own exit, e.g., through the roof.

Most buildings are destroyed from the indside out, once a protective shell has been penetrated, e.g., a window has been broken out.

"Vents" in hurricane shutters have no benefits, and only serve to weaken the protective shell around a building.

Andrew went 60 miles south of me when I lived on the SE coast.

/Neal