SPECIFICATIONS FOUNDATION VENTS #FV146G-1/8 Galvanized Steel · N.F.V.: 34 sq. in. • Rough Opening: 14 in. x 6 in. • 1/8th inch Screen 14 in. 35.56 cm 6 in. 8 in. 15.24 cm 20.32 cm 17 in. 43.