One Vent, Two Vent, None Vent? One Vent, Two Vent, None Vent? 2011/05/25 Maya H. It is far more common to see a center vent than side vents, however stick with what you prefer. If you have an ample backside, we'd suggest side vents; that way you can get a jacket that fits your body not your butt. Tags blazerjacket ventsmens blazers 0 Newer Stay Classic With Black and White! Older Head Home After a Stylish Memorial Day Weekend