How do I measure correctly?

Clear dimension:

1. Open the window.

2. Measure the clear opening by measuring the distance between the inner edges of the frame horizontally and vertically. Make sure you measure exactly from inner edge to inner edge to get accurate measurements.(Seal to seal)

If you have any questions about installation, please contact our customer service.

By combining these steps you can get accurate measurements for
a custom-made insect screen for gluing or drilling
depending on the structural conditions and requirements.