Further Detail The RoofLITE ESCA means of escape window is designed so that it can stay open, without being held. This will enable you (when necessary) to escape through the window without holding the window up. The standard ventilation valve allows airflow into the room even when the window is closed. The handle is made from moulded zinc and has three positions, two to allow passive ventilation. The window is made from high quality raw materials: FSC certified pine wood that comes from sustainable forests. The glass window has a Uw-Value of 1,4 W/m2K and has 24-mm double glazing (argon filled), a low E coating and a toughened outer pane. This guarantees reduced heat loss in the winter and limits overheating in the summer. RoofLITE windows are very easy to install. For DIY customers every box includes an easy-to-follow, step by step installation guide. The easy to install method is also well known to professional installers. Features & benefits: Excellent value for money, means of escape roof window. 10 years guarantee Comes standard with a ventilation valve. 24 mm double glazing. Allows up to 10% more daylight (than other branded windows). The window can stay open without being held. Easy to install.