You want the air to flow into the patio when the roller shades are in the down position

You do not want to obstruct air flow into your patio. Ideally, you want 24" from the bottom of the patio roller shade to the floor of your patio left open. Thus making for a 24" wide opening that air can flow through. These patio shades are 97% dense, air DOES NOT move through them. Breezes instead will push the fabric, like a sail on a boat. wwwJoshHobbs.com Patio Roller Shades