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How to measure a window opening for inside-mounted shutters. Take width at top, middle, and bottom, use the smallest number. Do the same for height on left, center, and right. Check both diagonals, and if they differ by more than 1/4 inch, mount outside instead.
Questions this video answers
Measure opening width in three places (top, middle, bottom) and record the narrowest measurement as the order width.
Measure opening height in three places (left, center, right) and record the shortest measurement as the order height.
If diagonal measurements vary by more than 1/4 inch, specify an outside mount treatment.
Direct mount is always ordered as a two-sided frame configuration.











