The FAMCO SDWVG wall vent is a hooded wall vent that is primarily used for air exhaust applications. It's made from heavy duty 28 gauge galvanized steel. The FAMCO SDWVG wall vent includes a 1/4 in screen to prevent pests from getting in and a built in damper for opening and closing the vent. There are 9 sizes available, ranging from 3 - 14 in (the size refers to the diameter of the pipe). Make sure to take accurate measurements to ensure you order the right size. The FAMCO SDWVG wall vent is manufactured by FAMCO in the United States and comes with a 1 year warranty against product defects and workmanship.