1.Frame material:Aluminum alloy 2.Size:Different size available 3.Back:Steel mes 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 matchApplicationexternal wall, sport ...