No, roof windows do not need to open. For instance, fixed flat glass rooflights are best suited for
utility rooms and laundry rooms, kitchens, and dining areas.
However, it all depends on your needs, so consider the purpose of the room you're going to install your
flat rooflights and how much ventilation you need in there.
You can choose from fixed, manual-opening, and electric-opening models, depending on your needs and
preferences.