Fresh air ventilation: A turn of the crank provides a large vent area. Lets air through, keeps insects out. Sturdy frame installs easily. Dependable operation featuring leak-resistant lid and weather-tight frame. Includes opaque white plastic lid. 13" x 20" plastic frame with 2-3/8" plastic garnish. Cutout dimension: 21-1/4" x 14-1/4".

 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