OptiLight VK wooden roof windows have a top-hung construction. The hinge system enables the sash to be opened to an angle of up to 45°. When open, the sash provides an unobstructed view to the outside and, where permitted by the product documentation, access to the roof for maintenance purposes.
| Window sizes [cm] (Frame external sizes) | 78x98 | 78x118 | 78x140 |
| Effective glazing area [m2] | 0,47 | 0,59 | 0,73 |
