Thank you for the incredibly fast response. If I could figure out how to post pictures of the room, I would so that the situation is easier to visualize. But the screen will pull down over the sliding glass doors, and will block them. There will be black out material behind the screen, in front of the sliders. This was the only way I could figure out how to add a projector and screen to this room. The room is a family/home theater room. The sliders won't be open when the screen is in use.