I pulled a grill over the weekend and ours was really nothing more than the same open cell foam you'd find if you're used to the larger AC grill mounted on the ceiling. It did have a cardboard border ring but it wasn't a part of a filter assembly, just looked to be a spacer.
I'm sure theres a cold air return filter out there just waiting to be used in an RV. Might even look for small thread inserts to use in place of the wood screws holding the grate to the ceiling.
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2019 Pinnacle 36 FBTS
2016 Silverado 3500 CC SRW DuraMax/Allison
1975 Corvette for the sunny days n dry roads
2017 RZR for the rainy days n muddy roads
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