... SpecificationMaterialaluminum alloySizeH x W, different sizes availableBladesingle or double blades Backinsect mesh:1.steel , 2 ... angles, tegular , concealed Finishinganodized sliver, powder coated or PVDF with any color, ColorAny color can matchApplicationexternal ... airport, bus station, etcPackagecarton box, plastic wrapped or as customer’s requirementsAdvantage of louverü Adjust indoor temperature ...