
The
LDD-S open and free to move like an unrestricted door.You can see the arm that engages with the lower guide to control closing

And closed, the door will not blow open.

Here you can see the closing mechanism using a combination of strong springs and patented Lapcon hydraulic dampers the arm pulls the door shut quietly.

The
LDD-D installs in a routed cavity at the top of the door making it very inconspicuous.