My suggestion.
Not an expert but I understand air flow is good for ac systems. Car or house. I would maintain flow. Just change once a year, low cost.
Pureflow Cabin Air Filter PC99204X | Fits 2013-20 Audi A3, 2015-20 A3 Quattro, 2016-18 A3 Sportback e-tron, 2018-21 Q2, 2018-20 Q2...