Vertical black-out systems can black out rooms completely. The units can be configured as left or right rolling blinds, and the black-out blind itself is available in a textile, Soltis or glass fibre material. The sloped inspection cover gives the box a smaller appearance. If desired, a rear ventilation profile can be installed behind the guide rails or on the box. This ventilation profile is made of extruded aluminium (28 x 9.5 mm) and powder-coated in RAL 9005 matt black.