Foam filter insert for the “Bigport” #9850 RV AC vent. Add a filter to your current vents or as replacement for existing foam inserts. Could use on other vents to. Just trim off excess.
Used in Newmar & Other RV Motorhome Filter fits Newmar Part #37945
Approximate size: 5 1/4" diameter
Foam filter will fits these eBay item number: 232111897129 eBay item number: 232176848989