(*) Depends on the clutch mechanism and if the installation brackets are to be mounted horizontally or vertically.
Important Note: On Roller Shades, the fabric will be 7/8-1 1/8 narrower than the shade headrail width resulting in a 7/16-5/8 light gap on each side of the shade.
If full coverage is required order an outside mount shade. To mount blinds and shades inside the window opening, measure the Width of the opening in 3 places (top, middle and bottom). Take the smallest of the 3 measurement. Similarly, measure the Height in 3 places (left, middle and right) again take the smallest measurement.
Remember to round the measurements to the nearest 1/8″ and record them as these are the Width and Height you will order. Do not make any deductions as the factory will do so.