There is a limit to how much total area is allowed to be comprised of openings on one side of a wall in relation to total area of wall space. The ratio escapes me now,(I believe it it 100 sq. in. opening per 10 sq. ft. of wall space) but I'll check when I get home. Also, remember that back-to-back openings are not allowed in the same stud bay, unless certain guidelines are followed, as well. I'm sure someone else on this site wil know.
