Guaranteed not to yellow. UV stable/colorfast. Smooth, aerodynamic, contemporary design. Easy to install. Wind tested to 190 mph. Push-lock, one-piece damper closure with large, sturdy hinges. White. cutout dim: 10-3/4" w x 4" h. outside dim: 12-9/16" W x 5-7/8" H.

 PROP 65 WARNING: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For more information, visit www.P65Warnings.ca.gov