genduct Posted September 21, 2010 Report 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
genduct Posted September 21, 2010 Report Posted September 21, 2010 PS high supply temp is either warm air getting sucked in or lack of insulation
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