Specialty doors, such as French or barn doors, need different types of frames, which are often more expensive. The cost of replacing high-end door frames can go up to $1,100.

Avanti Systems, a producer of office partitioning systems, has, in association with Scott Glass, introduced a 30 minute fire rated glass door that is entirely frameless and fully certified to BS476 ...

On one side, the inclined profiles of the aluminum frame outline a splayed door, almost tridimensional. A sense of depth with respect to the wall, defined by a 40-degree tilted surface.