genduct Posted September 21, 2010 Report Share Posted September 21, 2010 The old, but still useful rule for return duct sizing from ACCA MAn d is 700 FPM velocity in duct so about 1200 CFM/ 700 FPM =1.7 SqFt or 250 SqIn or a 24x10 duct with a grill 2x that or 24x24 The limited the velocity because of potential noise problems Link to comment Share on other sites More sharing options...
genduct Posted September 21, 2010 Report Share Posted September 21, 2010 PS high supply temp is either warm air getting sucked in or lack of insulation Link to comment Share on other sites More sharing options...
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