1. Depth: ( A minimum depth of 60mm is required for an inside mount)
2. Width: Measure the inside width from left to right, in 3 places (top, center and bottom of the window). Use the narrowest measurement and deduct 10mm for clearance.
3. Height: Measure the inside height from the top of window casing to top of sill in three places. Use the shortest measurement and deduct 10mm for clearance.
NB: You need to ensure that you take the 10mm deduction for clearance. Instant Blinds does NOT make the deduction for you.