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VELUX Commercial continuous rooflights, longlight, are 10 mm, 20 mm or 30 mm vaulted polycarbonate multiwall rooflights. They consist of polycarbonate sheets in multiwall polycarbonate material, in combination with aluminium profiles. The are installed on an insulated wooden upstand with plywood on both side (sandwich construction). VELUX Commercial continuous rooflights, ridgelight, are 10 mm, 20 mm or 30mm polcarbonate multiwall rooflights in ridge shape. They consist of polycarbonate sheets in multiwall polycarbonate material, in combination with aluminium profiles. The are installed on an insulated wooden upstand with plywood on both side (sandwich construction). 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 14963:2006, Roof coverings - Continuous rooflights of plastics with or without upstands - Classification, requirements and test methods and the CE-marking.