Thanks for the continued guidance HK.
If 150 cfm is 6" then if I work backwards to achieve similar flow (FPS) I get 270 cfm for an 8" round and 350 cfm for an 8" square duct.
Does that sound about right?
I am trying to see if I add one 8" round return duct from the basement return plenum to second floor with a large enough grill can I fix the return deficit with one additional return. My cfm deficit on return is about 372 cfm for the space. I am thinking if 270 cfm for an 8" round duct closes the gap (not quite enough but 50% better than what I have today). My sense is round duct might be easier to work into some of the angles and nooks I'll have to work around.
From a grill area square inches perspective I have a “budget” of 235 sqin for the three rooms which today has about 90 sqin of grills today. That leaves a 145 sqin shortfall.
My idea is to run an 8” round duct up from basement and carve out two interior wall stud bays and put a 10”x32” grill in place of the baseboard at this spot. The grill is slightly larger than I need but the duct is slightly smaller.
Does this sound logical to you? |
Member Since
05/12/2008
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