Direct or geared down chain operation. Uses aluminium alloy boxes of: Rollbox 245: 45x51 mm, Rollbox 265: 65x74,3 mm, Rollbox 285: 85x102,2 mm, Rollbox 2115: 115x136,5 mm The step-down system, recommended for blinds at the load limit, reduces the effort to operate the blind to 1/4. The blind can be stopped in any position. Ceiling or wall installation. Versions 265, 285 and 2115 are fitted with an inspectable box for blind maintenance. The aluminium side guides are available in widths of 40-55-65-80-120 mm The three systems can also be used without side guides.