Wasps, mud daubers, and rodents pose a serious threat to the refrigerator on your RV. They can enter through the refrigerator vents and cause serious damage by building nests that interfere with air flow. The Camco 42153 Flying Insect Screen fits Norcold refrigerator vents that have 27-1/2" 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 27-1/2" x 1-5/16"• Fits Norcold refrigerator vents with 27-1/2" louver openings• Protects the refrigerator from flying insect nests• Heavy-duty stainless steel mesh cover• Easy to install Fits Norcold refrigerator vent with 27.5"" long louver opening Easy to install Includes 3 screens | Camco Flying Insect Screen For Norcold RV Refrigerator Vent, 3-Pack