Inside Mount
Check the window reveal has enough room to house the honeycomb blind, at least 60mm, and that there is nothing in the reveal that will interfere with the operation of the blind.
Width
Measure the width of the window from the inside edge of the window frame from left to right. Measure at three points, top, middle and bottom and supply the smallest measurement.
Drop
Measure the height of the window from the inside edge of the window frame from top to bottom. Measure at two pints, left and right, and supply the smallest measurement.
Outside Mount (Installing Onto Architrave)
Width
Measure the width of the window from the outside edge of the architrave to the opposite outside edge. Measure at three points, top, middle and bottom and supply the largest measurement.
Drop
Measure the height from the top edge of the architrave to where you want the blind to finish. Measure at two points, left and right and supply the largest measurement.