Measure the width of the window screen opening from inside edge to inside edge
Measure the height of the window screen opening from inside edge to inside edge
Take measurements at the top, middle, and bottom for width
Take measurements at the left, middle, and right for height
Use the smallest width measurement
Use the smallest height measurement
Measure in inches
Round down to the nearest 1/16 inch if needed
Check the screen frame thickness if required by the manufacturer
Verify whether the screen is inset, flush, or exterior-mounted
Measure any existing screen frame if replacing an old screen
Confirm the corner style and spline size if ordering a custom screen
Record all measurements clearly before placing the order