Wasps, mud daubers and rodents pose a serious threat to the refrigerator on your RV. They can enter through the vents and cause serious damage by building nests that interfere with air flow. Camco 42149 (Model RS 600) Flying Insect RV Refrigerator Screen fits Dometic refrigerator vents which have 20” long louver openings. These easy to install screens will help ensure that your vents stay free from costly invasion by unwanted pests. Includes (3) screens measuring 20" x 1-1/2" Includes (3) screens measuring 20" x 1-1/2" Protects the refrigerator vents from flying insect nests Easy to install Heavy-duty stainless steel mesh cover