Skylight Window Blinds Venetians, Blackout, Insect Screens… Specially designed for Velux Windows, the skylight window blinds are easy to install come in a range of textiles, colours and styles. These are the only blinds to fit Velux windows. Before calling take a few steps and provide us with the following. Window code:- This is on a sticker at the bottom of the window. Usually begins with GGL… (This tells us the size). For more information call 020 7700 6000 or send an enquiry.