Arrow should point TOWARDS the cabin and INTO the car.
I also verified with FCP Euro as well:
"For filters, an arrow marking will generally denote the direction of flow (so in this case the air flows into the cabin, so you'd want that arrow facing into the car)."
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2016 340i xDrive - BM3 Stage 2 93 OTS - xHP Transmission Sutphin Custom Tune - B58TU HPFP - Bilstein B14 - VRSF Catless DP - Kyostar CAI - Dinan Midpipe
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