Some of the doors that can be slid away are very expensive and not practical to me. There are openers that open doors back, like a swinging gate operator. I did watch a you tube video after I posted where people in apartments, lakeside retreats, etc. were using garage doors to open up areas into the outdoors. My initial plans have been to leave it open on the pool side but I am sort of liking the idea of being able to close if off if it gets too buggy, during bad weather, or when it gets cold. I will have 24 feet across so a 16 foot door would work out nicely and leave wall space for a exterior walk in door.