INSIDE MOUNT SIZE:
Measure the width and length inside of the window frame. Select the window width and length to make the order. Window depth need more than 2 Inches, otherwise please choose outside mount.
OUTSIDE MOUNT SIZE:
Measure window outer frame width and length. Add +4 Inches on the window width. If your window frame is 34" wide, please select 38" wide shade.
Pls just select your window wide size.