Originally Posted by
pizzaguy
1) The fan draws cabin air from the cavity where the cabin filter is, after the cabin filter filters the air but before it passes thru the heater core or A/C evaporator.
2) The lid on the box is designed to resist air flow, but some still leaks past it, so there is flow.
Thanks Pizzaguy that was quite a lengthy reply about the black box and it's operation.
Soooo does that mean there is no exhaust vent so air will be forced around and exited out of the black box? No back pressure created on the fan pushing air into the box?