No way I'd be changing them out as long as they worked and most sure they have nothing to do with the air flow anyway. Just wondering if the fans are set on low, instead of auto or high. Doubtful though, unless the unit fans run continuously.
I have all the vents in the bedroom and bath shut off completely, which puts a lot more up front and where it's most needed. Still cools the bedroom just fine.
07 Revolution LE 40E_1 1/2 Baths_Spartan MM Chassis_06 400HP C9 CAT_ Allison 3000
Dinghy_2010 Jeep Wrangler JKU ISLANDER
1998 36ft. National Tropi-Cal Chevy Model 6350 (SOLD)