ClearSonic AX12-6 12 inch x 12 ft 6 Section CSP Height Extenders with H Channel AX2412x6ClearSonic AX12 6 12 inch x 12 ft 6 Section CSP Height Extenders with H Channel AX2412x6 AX Height Extenders add 12" of height to standard ClearSonic acrylic shields. Height extenders can be added to both A4 and A5 panel systems. The AX12's come complete with "H" channel and hinge so they can easily attach to the top of existing ClearSonic Panel sections. Complete systems will still fold "accordion style" even with the additional height extenders.