🔧 Elevate Your Airflow Game! Footprint of 18.75" x 14.25" ensures a secure and balanced installation. Crafted from robust 24-gauge CRCQ steel for unmatched durability. Equipped with a backdraft damper and bird screen for reliable operation. Compatible with 3.25" x 10" or up to 8" round ducts for easy installation. Elevate your ventilation game with optimal air and sound efficiency. Backdraft damper Easy installation 24-gauge steel The Broan-NuTone 634 Roof Cap is a high-quality, durable solution for enhancing the performance of your range hoods and ventilation fans. Made from sturdy 24-gauge CRCQ steel with a black epoxy finish, it features a built-in backdraft damper and bird screen for reliable operation. Its footprint ensures a secure fit, and installation is a breeze with compatibility for various duct sizes.