Disappearing retractable insect screens from National Screens 
The term "disappearing screen" has long been a generic name used to describe retractable insect screens. This is because the mesh is stored into housing at the jamb when the door is opened. By installing a Monarch Plus™ retractable insect screen and you will benefit from our patented design that incorporates a disappearing floor guide as well as disappearing mesh. With a Monarch Plus™ retractable insect screen there no channels at the sill of your door to trip over improving safety in the home. Monarch Plus™ is the ideal for screening bi-fold doors, French doors, balcony doors and screen enclosures. Monarch Plus Retractable Insect Screen for Bi-Fold Doors
http://www.youtube.com/watch?v=aR6079ebLA8
| 
