Selecting the type of mounting
Determine whether the blind is going to be installed inside the window frame or outside the window frame.
Inside Mount (IB)
Measuring the Width and Length for the Inside Mount: For the width, measure across the top, middle, and bottom of the window opening. Using the narrowest dimension, measure to the nearest 1/8”. By using the narrowest measurement the shade will operate correctly.
Outside Mount (OB)
Outside mount installations are mounted on the wall or on the window molding. It is best to overlap the window opening at least 3/4” on each side when measuring for roller shades.
Measuring the Width and the Length for Outside Mount:
Measure the area that the shade is to cover. For roller shades it is recommended to overlap the window opening by at least 3/4” on each side for a total of 1 1/2”. To allow for enough space for the mounting brackets and to cover the bottom of the window, the suggested overlap for a roller shade depends on the size of the shade and the valance option if required. If the window opening has a sill, measure from where the top of the shade will be located to the top of the window sill. Note: When outside mount blinds are specified, no factory deductions are taken.
The most common error in ordering blinds is reversing the width and length measurements. Always confirm that the width is the measurement that goes across from left to right and that the length is the measurement that goes from top to bottom.
Measure Twice....Cut Once!
The wrap is included in the window opening size. When measuring the length of the shade measure from the top to the bottom of the window opening. Do not include any extra for the wrap, as this extra material is included automatically.