Project Farm says the best 1" filter for filtering and good airflow is the 3M Filtrete 1900, which is a MERV 13 filter (https://www.youtube.com/watch?v=RkjRKIRva58), look at 10:57.
Pros: good airflow, best filtering
Reviews of 3M parts For Business
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5.0
Manufacturer Ranking
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2
Spare Parts
2
Country
USA
Spare Parts
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I highly recommend Eurovision, I had them add 3M Crystalline (70%) to the windshield on my A4 Avant and ceramic (5%) on the panoramic sunroof. They did an excellent job and I noticed the car stays a bit cooler inside.
Pros: excellent job, cooler inside
Vehicle:
Audi A4
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