11: I want to use my own columns or post. How far apart should I space them?

All of the fence sections are 72" long. When using standard 2" aluminum post, the centerline post spacing is 72½", the fence sections slide into the post ¾" on each side . This leaves a ½" gap between the fence channels inside the post. For columns, 72" – 72" ¼" spacing between is recommended.