A 10-inch round duct (approximately 78 square inches) connected to a 6-inch round duct (approximately 25 square inches) creates a 3:1 mixing ratio, allowing a ventilating dehumidifier to proportion outdoor supply air versus indoor recirculation based on duct diameter.
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Unidentified Speaker — Home Pressure Effects of Unbalanced ERV, Ventilating Dehumi… [7nhXP3v5Zy0]Evidence Quote
“this is a 10 inch round duct that is 78 square inches roughly this is a six inch round duct that is approximately 25 square inches it's 28 but what we're going to use a three to one so we've got 75 square inches set and 25 square inches [8:53]”
Source
Home Pressure Effects of Unbalanced ERV, Ventilating Dehumidifier, or Supply-Only Ventilation— Home PerformanceCreated: 8/13/2026, 3:25:18 AM
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