james250 12 Posted January 28 Share Posted January 28 The OEM pollen filter has an arrow saying TOP matching the TOP arrow on the plastic holder for the filter. But aftermarket filters have airflow arrow. From what I understand, is it correct that the airflow arrow actually needs to point opposite direction to top arrow on the holder? Quote Link to post Share on other sites
johnatg 401 Posted January 28 Share Posted January 28 Yes the flow goes downwards towards the inlet of the (centrifugal) fan 1 Quote Link to post Share on other sites
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