Where is recirculating air pickup inside the car?

[Hooch180]

Hi,
I borrowed ozone machine from my friend. I wanted to ozone the HVAC system in car. I wanted to place ozone generator as close as it is possible to the internal air recirculation intake as possible.
Where is internal air intake?

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[ALLSTOCK]

Glove box!



Might be a better one somewhere else though, but thats where the cabin filter lives.