AX2418 Height Extenders add 18 inches of height to standard CSP systems. ‘H’ channel and hinge are included. The AX2418x2 is normally used as an ‘add-on’ to increase the width of an existing AX2418 system by 48 inches. When it’s time to break down, CSP systems with AX height extenders installed correctly will still fold ‘accordion style’ for easy storage.