Door Louver, Material Aluminum, Finish Clear Anodized, Louver Opening Height 18 1/2 in, Louver Opening Width 24 1/2 in, Rough Opening Height 18 1/2 in, Outside Height 20 1/8 in, Outside Width 26 1/4 in, Free Area 1.7 sq ft, Flange Width 1 1/4 in,...