SPECIFICATIONS EAVE VENT #EV223-1/8 Galvanized Steel · N.F.V.: 39 sq. in • 1/8 in. mesh • Rough Opening: 22 5⁄8 in. x 3 ¾ in. • Stucco Flange 22 5⁄8 in. 57.47 cm 3 ½ in. 8.