Styles of Panels
How to Measure
Simply measure "A" from Inside Brick Mold to Brick Mold, and "B" from Brick mold to window sill. Proper fitted Shutters should be half of width, "A" and full Height of "B".
For functional closing shutters, a slight bevel would be required on bottom for window sill. Typically center rail should be in line with center sash.