Measure the width of your window area to be covered. The widths of the Roman shades listed are from edge to edge of the headrail and fabric.
FOR INSIDE MOUNT
Measure your window opening and choose a shade that is slightly narrower. A small amount of light may show on either side.
FOR OUTSIDE MOUNT
Choose a shade that is approximately 3 to 4 inches wider than your window opening. An outside mount is always recommended for best coverage and light control.
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