How to choose the size?
Measure the window size inlcuding the frame,but if you want to stick the screen on the wall ,the size should expand more to the wall (the width of adhesive strap is 1inch). Then choose the fil size bigger than your size.
For example:
you need film 34 width X 40 height, you can choose 46X63in;
you need film 50 width X 60 height, you can choose 63X63in
you need film 70 width X 75 height, you can choose 74X79in