3 1/2" shutters are by far our best selling shutter. When talking with clients we often find that the 2 1/2" shutters are too small and the 4 1/2" shutters are too big. Over the years we have found that 3 1/2" shutters normally account for 67% of our annual shutter sales. The reason is that the 3 1/2" shutters are just the right size for almost any window and give a more contemporary, open feel than the 2 1/2" shutters.