Fresh Air intake? 2005 Elantra GS

I need to run a cleaner (atomized solution) through the vent system of a car owned by a heavy smoker. Already tried cleaning the cloth in the vehicle, but the air system needs cleaning.
Anyone know where the air-intake (fresh and inside) are located?
--
You can't trust your best friends, your five senses, only the little
voice inside you that most civilians don't even hear -- Listen to that.
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Through the right side of the cowl at the base of the windshield.
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In article <d0a5d0ed-ec36-410f-a235-86549036c1c6

Thanks
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