The Best Of Both Worlds...
For those who want the advantage of a sliding patio door - but
the ability to have ventilation without having to slide the
whole door, there is the "Tilt 'n' Slide' door.
One leaf is
fixed and the other can be tilted back to give ventilation only.
When required as an exit, the leaf can then be slid back like a
conventional patio door. There is also the option of fitting an
external handle. All in all a highly versatile means of
ventilation with an entry/exit facility.