I think most of us use those vents open as a cold air dump right into the rig for quick cooling in that area. Those vents also can be adjusted (totally closed) to force the maximum cold air into the duct system if installed. Adjustments in between proportion cold air forced through the ducts and that forced straight down
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2013 RAPTOR 300MP w/Rear Patio Deck NO Folding Side Ladder
2013 Silverado 3500HD LTZ CC LB 4X4 DRW
Duramax 6.6L Turbo Diesel; Allison Trans
Reese 20K; Carlisle Radial Trail RH/HD; TPMS (12 Tires)
Veteran
PSU (GO LIONS)
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