If you wish to mount the Greenhouse on a plinth but be able to have the doorway at ground level, then this option is the solution. Consists of a frame above the door which extends the door down lower than it would otherwise be. For example if you wish to put the Greenhouse on a small plinth, or if you wish to have a higher Dwarf Wall height than the standard height. Can be cut and adjusted to size on site by virtue of being glazed with plexiglass.