A minimum of 1" x 1" flat surface is required for the mounting brackets. To determine the inside measurements for the window:

• Measure the width (distance across from one inside face to the other). Measure at three different places, and use the narrowest dimension when ordering (A dimension). It is critical to measure the top width on the inside mount where the headrail will be mounted. The factory will automatically deduct 1/2" from the inside measurement for slat width to allow for out-of-square window casings.
• Measure the height (distance from the top soffit down to the sill. If no sill, or an overlap is desired, measure to the lowest point you want the blind to reach (B or C dimension).
• Measure the sill height (distance from the sill to the floor). This will ensure that the operating controls are made to the proper length (D dimension).

A minimum of 1" x 1" flat surface is required for the mounting brackets. It is recommended that the blinds overlap the window opening by at least 2" on each side (total 4") to ensure privacy and to control sunlight. To determine the inside measurements for the window:

• Measure the width (distance across from one inside face to the other) taking into account at least 2" overlap on each side (A dimension).
• Measure the height - distance from the top (where the mounting brackets will be) to the top of the sill. If no sill, or an overlap is desired, measure to the lowest point you want the blind to reach (B or C dimension).
• Measure the sill height (distance from the sill to the floor). This will ensure that the operating controls are made to the proper length (D dimension).