The FAMCO AI Plastic Wall Vents with Fixed Louvers are made of High Density Polyethylene (HDP) plastic, making them durable and long-lasting. They feature UV inhibitors for greater stability in all weather conditions, color stabilizers, a 1 inch collar for secure pipe attachment and heavy duty borders for secure and durable mounting. This AI Wall Vent has fixed louvers and a molded screen. It can be used for air intake or exhaust applications. The FAMCO AI Plastic Wall Vents come in sizes that can be used on pipes measuring 4 inch, 6 inch, and 8 inch diameters. They are available in 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 Plastic Wall vents are manufactured by Famco in the USA and come with a 1-year warranty against product defects and workmanship. If you have any questions about this vent, please refer to the FAQs above or feel free to contact us by phone or email.