Depending on the type of wall the door opens into, the counterframe has different technical features.
Single door
A single door is made from a single panel.
Double door
A double door is made from two panels.
Telescopic door
A telescopic door is a door made from two parallel panels which slide with a telescopic movement. A telescopic door is used when the wall that the door has to fit into is not long enough to accommodate a panel of standard size.
Flush mounted door
A flush mounted door is a door without jambs which fits completely into the wall. Flush mounted doors are a feature of many modern buildings.
Counterframes for external doors and shutters with single guide
Only one of the two doors or shutters can be fitted: the shutter or the security grille.
Counterframes for external doors and shutters with double guide
The shutter and security grille can both be fitted together.
Lifting windows and lifting French windows
The name comes from the light upwards movement that the windows make while opening and closing.