The ScreenLine® SL20S is a manual system comprising a 14 mm pleated blind integrated within a double glazing unit with 20 mm cavity. The blind movement is achieved by moving a magnetic device positioned centrally on the outer surface of the internal glass across the glass surface. This external magnet interfaces with a similar internal magnet located in the moveable head-rail and it is so designed to absorb possible glass deflections. The application of Verosol pleated blind fabrics, coated with an aluminium layer on one side, reduces solar heat gain and improves U_value, whilst regulating the light passing through. Light transfer down the blind edge is eliminated by the use of special "L" shaped-side guides