Unfortunately, I have no way to know what exact AC setup you have on your 2021 Keystone Passport SL Series travel trailer. You are likely going to have an air distribution box on your ceiling below the air conditioner which will house a filter. We have them in a few different size which I have listed below you can compare with your filter.
Replacement 14" x 7-1/2" Carbon Air Filter for Dometic # RA43QV
Replacement 16-1/2" x 6" Air Filters for Coleman Mach # RA68QV
Replacement 16" x 4"... view full answer...
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