User1, sorry for the late response, but up until your last post I didn't completely understand what you were asking. There are the two vents on each end of the dash and the double one in the center of the dash. There is also one down by your feet and the defrost at the base of the windshield. The bottom left slider controls whether the air is recirculated or brought in fresh. Fresh vented air kind of sucks on the van as the inlet is small and it doesn't get the "ram air" effect. Intake air must also pass through the fan motor squirrel cage before entering the cabin. The outside air intake is behind the passenger side headlight and doesn't really move too good unless you turn on the fan. Even then it's pretty lame. This is one of the reasons why I'll never give up my AC..........at least not without a fight. Tim