SPECIFICATIONS GABLE LOUVER GLPG1424B-0.125 28 Gauge Bonderized Steel · N.F.V.: 147 sq. in. • 1/8 in. Screen • Rough Opening: 14 ¼ in. x 24 ¼ in. 14 in. 35.56 cm 24 in. 61 cm 7⁄8" 7/8 in.