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How to Measure

Measure each window individually as a size variances are common. Record width first, then height (also referred to as length) to the nearest 1/8 inch. Measure width from left to right, height from top to bottom using a steel tape measure. Do not use a cloth tape.

Inside Mount
Inside Mount shades are installed inside the window casing. See below for window casing minimum depth.
  1. Measure the exact inside width of window casing from one inside edge to the other in three different places. Record the narrowest measurement.
  2. Measure the exact height in three different places from top edge of opening to top of sill. Record the longest measurement.
  3. Do not take deductions. Allowances are made at the factory to insure a proper fit.
Outside Mount
Outside Mount shades are installed outside the window casing, covering an area larger than the window itself.
  1. Measure the exact width to be covered. Be sure the measurement overlaps the window opening by at least 1 1/2 inches on each side (3 inches total overlap) to insure light control and privacy.
  2. Measure the exact height to be covered, including desired overlap. (Typically from top edge of molding to bottom edge, or to top of sill if there is one.)
  3. The factory makes 1/8 inch deduction for an outside Mount.