Measuring Vertical Blinds

Before measuring, check there are no obstacles in the way of the shade (window latches, door handles, central heating pipes, etc.)

For inside recess mounting:

Measure the frame's width at the bottom and top, and its height both right and left.
Order the smallest width and drop measured in mm.

For outside recess mounting:

Measure the frame's width at the bottom and top, and its height both right and left.
Decide the size of the overlap on the frame. Order the smallest width and drop measured in mm, adding the overlap.