The FAMCO FA50 Plastic Roof Vent with 50 square inch net free area is made from High Density Polyethylene (HDP). HDP is one of the most versatile and widely used plastics available. Outdoor integrity is maintained in all of our plastic products by the addition of UV inhibitors which protect the material from deterioration in sunlight. Our colors have stabilizers added during the manufacturing process to prevent fading. These vents are resistant to cold, heat, and ultraviolet rays. The FA50 roof vent has a screen molded in to it to prevent bird nesting. This product is a standard residential roof vent with 50 square inches of free area. Six colors available: black, dark brown, light gray, wood gray, and white. The FAMCO FA50 Plastic Roof Vent with 50 square inch net free area has a flange measuring 15-1/8 x 17-1/2 inches with an inner opening of 8 x 10 inches. The FAMCO FA50 Plastic Roof Vent with 50 square inch net free area 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 product, please refer to the FAQs above or feel free to contact us by phone or email.