The retractable insect screens are supplied in ready-to- install units, in kit form or in parts and they provide a wide range of versatile solutions for all windows and doors. The Genius retractable flyscreens are available in 7 lines: S.31, S.33, S.36, S.41, S.43, S.46, S.41 built-in, S.46 built-in to fit all kinds of wood, aluminium and PVC frames. A patented viscodynamic brake ensures that the screen retracts evenly and smoothly.