On my unit, that's right where the return vent is as well as the normally-blocked central high-output vent. What I'm thinking is that your setup is different, yet the A/C unit is still open at the bottom when it shouldn't be.
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-Scott, DW, DG, DB, and DD
2011 Passport 2590BH
2009 Ford F150 SuperCrew F X4 5.4L w/Max Tow
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