Our split level main floor has poor air flow to one of the levels. This level has is ducted by a 9" dia duct positioned 1/2 way up the 30" vertical by 20" sq. plenum. At the top of this 30" vertical plenum are 2 - 8"x 18" ducts coming out the sides. One of these feeds the basement and the upper level of the split level the other feeds the upstairs. Both of these runs feed by the 8" x 18" ducts function fine with noticeable air flow.
The 9" round duct halfway up the vertical plenum...
Poor Original Design? Do I need a duct booster?
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