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Yes it's normal. The outside air intake is in a high pressure zone when your driving, so air is beeing forced inside, even with the fan not running.
On my previous car (acura RSX), it was like twice as much air as the BRZ. I would basically drive half the time with the fan off, because the air getting inside was sufficient.
Putting it in recirc would solve this, but it's not a bad thing to have a bit of fresh air getting inside. Without fresh air, on long drive, the CO2 level will rise, and can cause headhache and get you tired.
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