PVC Opstand 75x165 cm Fixed or openable?:Openable version esthetiek en isolatie esthetiek en isolatie Installing an electric roof access skylight with PVC curb 30 20 & iWindow2 flat roof window 1200 x 1200 mm Please note Tailor the design to your specific project: choose a sloped version to capture the maximum amount of daylight and distribute it evenly throughout the room you choose flawless and completely watertight installation of your skylight or flat roof window