http://yourhoustonhomeinspector.com/living-in-your-home/green-home-conversion/improving-return-air-ducts-older-homes/ WebMay 26, 2005 · 3.Test the External Static Pressure of the supply and return duct system on both units,compare to the mfrs. fan data chart,to see what total cfms can be delivered. 4.Run a manual D,from ACCA ,to see what size ducts "should" be installed and compare to existing ducts,to plan changes needed.
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