... 3High quality and long last Features Specifications: Window shutter and louver CharacteristicAcid-resistant, Fire-proof,Shock-proof, Weather fastness, PVDF ... .decrease the sun untraviolet radiation,3.Sun shutter and louver can reduce the strong sunlight,4.reduce indoor temperture ... cost.6.At the same time, Sun shutter / Sun Louver stuucture make the building magnificent apperrance. Sun Shutter:Xinjing ...