Decelerated free spring operated. Aluminium alloy boxes of: Rollbox 145 - 45x51 mm, Rollbox 165 - 65x74,3 mm, Rollbox 185 - 85x102,2 mm. The spring deceleration system regulates the blind rising speed. The blind can be stopped in several positions or when fully opened/closed. Ceiling or wall installation. Versions 165 and 185 are fitted with an inspectable box for blind maintenance. The aluminium side guides are available from 40 to 55 mm. Rollbox 165 and 185 are fitted with a limit stop system (optional). Versions 145 and 165 are available in the special version for skylights; horizontal, vertical and sloping installation. Max. size 120x120 cm. All three systems can also be used without side guides.