The YARDLITE (RoofLITE) DVX C4A centre-pivot roof windows have a slimline wooden profile with built in ventilation value. With 24 mm double glazing and toughened outer pane provides good thermal insulation . The ventilation valves allow fresh air into your room through passive ventilation. The centre-pivot window has an elegant bottom handle and has easy installation for all roofing types. The DVX roof window is suitable for roof pitches between 15°-90° and comes with the standard RoofLITE 10 year guarantee.