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The frame profile is 65mm, therefore, to work out your clear opening size, minus 130mm from your chosen external frame size. E.g. 995mm external frame will give you a clear opening of 865mm when the door is open at a 180 degree angle. If the door can only open to a 90 degree angle, minus an additional 50mm from 865mm.

For the clear opening height, remove 80mm from the external frame height (2020mm-80mm=1960mm)