When in the open position, both panels fold parallel and at 180º flat back to the wall, allowing virtually 100% access. In the closed position this screen seals off the opening, being virtually waterproof.
The gliding mechanism is foolproof, where it is impossible for the door to drop and provided the track is lubricated, perhaps once a year, the movement is effortless.
No rivets or screws show on the outside, and there are nylon adjustment buttons on the catch post to regulate the tension and even a silence button at the bottom of the door to avoid any “clanks”.
An ideal solution when space is an issue.