Measuring
Simply measure the width and drop of the visible glass size of each window or door.
Measure from where the glass meets up with the rubber seal (not including any of the rubber seal in the measurement).
Making sure that the window is ‘not out of square’ it is worth checking the width measurment at the top, middle and bottom to make sure they are the same. If there is some variation, then provide us with the shortest measurement.
Ideally, we look for the sizes to be given width and then height and in mm’s if possible, though will help convert them if you are using any other unit of measurement.