Builder's Best GRV624 Series - 6" Diameter Roof Vent Hood Flush Tail with Flapper and Screen is made from 26-gauge galvanized mill finish steel for strength and durability. It includes a 1/4" x 1/4" removable screen to help block debris and pests, while the flush tail design ensures a clean, streamlined installation. The built-in flapper allows efficient airflow and reduces backdraft.