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The grid_connected Velux flat roof windows CSP consist of a motorised (two motors) base unit for smoke ventilation made of a PVC curb with an integrated glazing unit and a scissor arm lifting device for the top unit as well as a 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, EN 12101_2: Smoke and heat control systems – Part 2: Specification for natural smoke and heat exhaust ventilators and the CE_marking