Further Detail The RoofLITE NITO and RoofLITE HIVE roof windows are made from FSC certified pine wood that comes from sustainable forests. The glass pane has a Ug-Value of 1,1 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. The “slimline” design gives a modern look from the inside of the room. This unique design by RoofLITE also allows up to 10% more daylight in (than some other branded windows). In addiyion the RoofLITE NITO provides a ventilation valve that allows airflow into the room even when the window is closed, so that when you’re not at home, you can still ventilate the room. Installing RoofLITE windows is easy. Just follow the tried and tested procedure which is clearly set out in the installation guide included with every window. Features & benefits: Excellent value for money, base model roof window. 10 years guarantee. 24 mm double glazing. Allows up to 10% more daylight (than other branded windows). “Slimline” design that gives a modern look. Easy to install.