Measuring for Inside Mount:
Step 1: Please measure the inside width at three locations: the top, middle and bottom. Record the smallest of the three measurements. This should be your ordering width. We will make necessary deductions, usually 1/2".
Step 2: Measure the height at three locations: the left side, middle and right side. Record the largest of the 3 measurements. This should be your ordering height.
Measuring for Outside Mount:
Step 1: Please measure the width of the area you wish to cover. If space allows we recommend adding 4" (2" each side) to this measurement to help reduce light leakage. This should your ordering width and will be the overall measurement of the shade.
Step 2: Please measure the height of the area you wish to cover. This should be your ordering height.