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The Velux Flat roof windows CXP consists of a manually operated base unit made of a PVC curb with an integrated glazing unit and hinges on one side to allow for venting and a top unit with one-layer opaque or transparent acrylic (PMMA) dome. For the placing on the market of the product in the European Union/European Free Trade Association (EU/EFTA) (with the exception of Switzerland) Regulation (EU) No. 305/2011 (CPR) applies. The product needs a declaration of performance taking into consideration EN 1873:2005, Prefabricated accessories for roofing - Individual rooflights of plastics - Product specification and test methods and the CE-marking. For the application and use the respective national provisions apply.