Jumper Duct or Transfer Grille for Central Air Return
Does anyone know which performs better, a jumper duct or transfer grille (Tamarack R.A.P to be specific)?
Original plan was to take my central air return in the hallway and stub ducts in the attic to get individual air returns to each bedroom.
Now I am down to the transfer grille or the jumper duct. My 1st choice would be jumper ducts for aesthetics and better air volume capabilities. The only place I can install transfer grilles is above the doors, and the wife wants that tall craftsman trim on the doors 🙄
Can I assume that I will have condensation problems with jumper ducts in an unconditioned attic (Northern Illinois)? If not, flex duct or metal and what R-value duct insulation? Any recommendations on the ceiling boxes?
If the transfer grilles are your preference, which is your preferred manufacturer and model?
Thanks in advance!
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