How much Return air is needed for a 5 ton system with the blower set on 2000cfm .. I currently have a 20x30 return air grill and I don't think that is big enough?
What's behind the grill?
you should add at least another return of similar size strategically located in your home. one return even if large enough would not provide good airflow for a 5 ton calling for 2000 CFMs.
Maybe I will figure out how to add a flex return duct across the house..Hmm
The duct inside the chaise that goes up in to the attic is 27.5" width and 19.5" depth..