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Mud dauber wasps and other insects love to build nests inside RV refrigerator vent openings, and a blocked vent can lead to poor cooling or worse. This set of three plastic screens covers refrigerator vent openings to keep pests out while still letting the fridge breathe.
They're a simple, inexpensive way to head off a problem that's much more annoying to clean out after the fact.
Check them periodically and clear off any debris to keep airflow to the refrigerator unrestricted.