Skylights is a translucent part of the roof construction, designed for efficient natural lighting of interior space of buildings, as well as for natural ventilation and removal of smoke. Transmittance of light through the skylights (rooflights) is 40-50% higher than ordinary windows. This makes it possible to provide the amount of daylight, which according to the standards necessary for a particular room. The main advantages of skylights using are: energy savings due to the natural lighting, savings in ventilation equipment through effective natural ventilation, the possibility of rapid elimination of smoke, increasing the safety of buildings in emergency situations, improving the aesthetics of buildings. Design of skylights consist of an aluminum / steel frame, which includes bars and crossbars. To fill uses two-, three- or four-layer polymeric glazing (polycarbonate stirolakrilonitril), as well as glazing of tempered glass or triplex. Functional capabilities of skylights are divided into non-opening (deaf) and opening (there is the possibility of opening by mechanical devices or drives for ventilation and smoke). A special kind of skylights are translucent roofs .