Glass Louvres Breezway Altair Louvre WindowThe superior design of Altair Louvre Windows ensures that they seal tightly in all conditions, from calm winters days right up to summer cyclones. When fully open, the louvre blades are close to horizontal. This means they provide very little resistance to the air entering through the window opening. In effect, you get twice as much ventilation as you would through a same sized sliding window or double hung window. See Technical Specifications(PDF) Capral Platinum louvreThe beauty of the Capral Platinum louvre window is that it offers the greatest airflow compared to any other window. By changing the angle of the louvre blades, natural cool breezes can flow through your home.