Where is the air intake inside the cabin of a 95 camry?

I was wondering if anyone knows where the Cabin air intake is on a 1995 camry wagon. Not the one outside the car by the windsheild, I mean the vent inside that draws air from the cabin when recirculate is enabled. My car has no cabin filter and no set up for one outside the car in the usual place, so I want to construct a filter box for the intake inside the cabin thats used in recirc mode. There must be a vent the recirc is drawing cabin air in from but I just can't seem to find it without ripping the whole dash apart. Does anyone know or have an idea where it is? I Let me know thanks.