Easy-to-install Camco Flying Insect Screens help ensure that your vents stay free from costly invasion by unwanted pests. Wasps, mud daubers, birds, and rodents pose a serious threat to your RV appliances. They can enter through vents and openings and cause serious damage by building nests that interfere with air flow. Camco Flying Insect Screens help protect your valuable investment. Fit Dometic refrigerator vents which have 20" long louver openings. Includes 3 screens measuring 20" x 1.5". Fits Dometic refrigerator vents with 20" long louver openings Includes 3 screens measuring 20" x 1.5" | Flying Insect Screens for Dometic Refrigerators, 3-Pack