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Jeff; There are many variables that can enter in to a calculation that will be mathematically true, but a simple calculation, disregarding the present system layout, duct size, static pressure, equivalent length calculation, Delta T, Temperature differentials,etc etc, would be; A 6" round will handle approx 100 cfm, which is sufficient to SUPPLY an area of 160- 180 sq ft of floor space (assuming normal ceiling heigth, and adequate insulation)....Return air must be sized for 100 % of the supply. Note ; your .35 a/c (air change) has nothing to do with this calculation. Hube
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