We have vertical shades in our lanai and there are no gaps. They slide across from one end to the other and there is a solid metal piece on the end that goes into the window ends. They are double cell shades and can't see even a shadow. You can open them all the way during the days. Don't remember the mfg but got them at Lowes, who installed them as they are pretty involved. We consider them one of our most successful purchases when setting the house up. Increase the functionality of the lanai greatly.
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