Cosmetic
This is the position of the midrail opted for in the door sections of the french door.
Mechanical/Technical
If you do not select a custom midrail height this is supplied automatically at 850mm for standard door designs. You can also select the height you desire. This height is measured from the bottom of the frame to the centre of the midrail.
Please note this does not include any cill or frame extenders requested.
The thickness of the midrail is determined by a letterbox, If a letterbox is required, a 110mm midrail will be used otherwise a 85mm midrail will be used.
For more information, please see our survey guide.