The FAMCO WVEBA Hooded Wall Vent With Screen, Damper, Spring & Gasket.The WVEBA Wall Vent is made with a spring loaded damper, gasket and screen. This vent cap is used as an exhaust vent and has a removable screen. Large hood design prevents restricted air flow. Quality crafted of Heavy Duty .020 Aluminum. The FAMCO WVEBA Hooded Wall Vent includes a ¼ inch screen to prevent pests from getting in and a built in damper on a light spring for opening and closing the vent. The WVEBA is available in sizes ranging from 3 inch to 10 inch (the size refers to the diameter of the pipe). The FAMCO WVEBA Hooded Wall Vent is manufactured by Famco in the United States and comes with a 1-year warranty against product defects and workmanship. If you have any questions about this wall vent, please refer to the FAQs above or feel free to contact us by phone or email.