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The gridconnected Velux flat roof windows CVP Q consist of a motorised base unit made of a PVC curb with an integrated glazing unit and hinges on one side to allow for venting. The product has insulation in 4 chambers. The gridconnected Velux flat roof windows CVP U consist of a motorised base unit made of a PVC curb with integrated glazing unit and hinges on one side to allow for venting. The product is similar to CVP Q, but with adifferent glazing unit and only insulation in 2 chambers. On the of the base unit is installed a onelayer 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 CEmarking.