Art's Sheet Metal V624FOAM 14" x 18" Flange-On-Back Gable Vent provide 125 square inches of free flow area for ventilation. The 1/4" galvanized expanded metal screen on the back helps keeps birds and insects out. This style vent is frequently used on new construction brick, stone, stucco, wood and fiber cement siding applications. This nail flangce-on-back fin will be covered by trim or the final wall finish. Outside Dimensions: 14" (W) x 18" (H) Free Air: 125 square inches Promotes free air movement in attic Galvanized 28 Gauge Metal Flange On Back for wood trim