The FAMCO FA50 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 prevent bird nesting. This product is a standard residential roof vent with 50 square inches of free area. Available in six colors (black, brown, dark brown, light gray, wood gray and white).