aluminum louver 1. Surface color stable for 30 years' usage 2. CE Certification 3. function well, easily operat SpecificationMaterialaluminum alloySizeH x W, different sizes availableBladesingle or double blades Backinsect mesh:1.steel , 2.stainless steel Edgesupply air at any angles, tegular , concealed Finishinganodized sliver, powder coated or PVDF with any color, ColorAny color can ...