A: total, expected width of the blind.
B: total height, including the headrail.
We will make the blind to the size you specify!
We recommend you add an overall overlap of 70mm to the width (A). Measurement B refers to the total height (drop) of the blind.
Always measure using a steel tape measure and check for any obstructions in the fitting area.
Also select this option if you have measured an existing blind.