You can assemble the product in two ways: in between the window frame/walls. or on the window frame/wall.

- If you want to assemble the product in between the window frame/walls, then measure several places in the window frame, because a window frame doesn't always run straight. Our advice is to subtract 1 cm from the smallest measurement, therefore the product won't touch the window frame. This outcome is your final measurement. Please keep in mind that the fabric is always smaller than the total product, this causes small light gaps between the window and the product. 

- If you want to assemble the product on the window frame/wall, then measure several places in the window frame. Add 4 cm on the widthest measurement, this will ensure that the complete window is covered. This outcome is your definete product size.