Louver is a building material that is installed in a barbed shape with glass material (glass, aluminium, wood) to transmit light while avoiding direct sunlight, that is, to allow soft lighting without disturbing ventilation.

It can be classified into electric type and fixed type, and it is installed to control the beam through the roof or window by making it vertical and horizontal type according to the direction. Recently, the louver is installed on the veranda, terrace, etc., not only for the purpose of lighting windows and roofs, but also to enhance the design of the building and to increase the value of the building.