The FAMCO LH Plastic Wall Vents with Movable Louvers are made of High Density Polyethylene (HDP) plastic for durability and longevity. They are made with UV inhibitors, giving greater stability in all weather conditions, and feature a full 1 inch collar for secure pipe attachment and their heavy duty borders ensure secure and durable mounting. This LH Wall Vent has movable louvers and is used as exhaust vents for dryer and bathroom installations. The FAMCO LH Plastic Wall Vents come in sizes that can be used on pipes measuring 3 inch, 4 inch, 5 inch, 6 inch, 7 inch, and 8 inch diameters. Available colors are brown and white. PLEASE NOTE: THE SIZE YOU SELECT REPRESENTS THE SIZE OF THE PIPE IT ATTACHES TO. View the Spec drawing for more sizing details. The FAMCO LH Plastic Wall vents are manufactured in the United States by Famco and come with a 1-year warranty that covers product defects and workmanship. If you have questions regarding this vent, please read the FAQs above or feel free contact us by phone or email.