VELUX A/S is a Danish manufacturing company that specialises in roof windows, skylights, sun tunnels and related accessories, such as blinds, shutters, sunshades and mosquito nets. The company was founded in 1941 by Villum Kann Rasmussen. The company is headquartered in Hørsholm, Denmark, and is a part of VKR Holding A/S. VELUX Group is a founding partner of the global Active House Alliance.