Try to create zones, either with fans (flowtech), or dampers (electric or mechanical).
Next, however many regulators you have (feeders) you need to get that amount of air back into the furnace, or it will just not supply enough air.
Blow the air into the house along the outside walls, and suck it in the middle, note the air flow then.
Cold Air Return Noise
Efficiency of Cold Air Returns
Cold Air returns in the up stairs of my 1910 2 story...
cold air returns
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