The window covering will hang inside the window frame.
Width:Width: Measure the EXACT distance across the
window from the inside edge of the frame to the opposite inside edge in
three places. Use the narrowest dimension.
Height:Measure the EXACT distance from the top inside edge of the
frame to the bottom inside edge of the frame in three places. Use the
longest dimension for horizontal coverings, and the shortest for
vertical coverings.
Window Depth: The amount of space from the back of the window or
obstruction to the windows outer edge (see below).
Flush Mount
1.50" for 1" and 1/2" Mini Blinds, 3/8"
Honeycomb Shades and Pleated Shades
2.25" for 1" Wood Blinds and 3/4" Honeycomb Shades
The window covering will hang outside the actual window frame, over
lapping the window frame enough to cover for maximum privacy and light
blockage.
Width: Measure the EXACT distance from the outside edge
of the left side of the window frame to the outside edge of the right side
of the window frame and add at least 2 inches for horizontal blinds and
4 - 6 inches for verticals.
Height: Measure the EXACT distance from the top outside
edge of the window frame the bottom outside edge of the frame and add at
least 3 inches for horizontal blinds and 4 inches for verticals.