Duct Construction Specs: system leakage
VAV CAV supply downstream box construction to VAV CAV supply upstream box construction
ASHRAE duct construction specifications: sheet metal gauge thickness and weight for galvanized, uncoated, and stainless steel ductwork; duct leakage percentages by leakage class and flow ratio; and maximum allowable fan system leakage by HVAC system type
| data type | gage | max leakage pct (%) | system type | test condition | test pressure inwg (inWG) |
|---|---|---|---|---|---|
| system leakage | VAV CAV supply downstream box construction | 5 | VAV and CAV supply systems | During construction | 1 |
| system leakage | VAV CAV supply operating | 5 | VAV and CAV supply systems | Operating | — |
| system leakage | VAV CAV supply upstream box construction | 5 | VAV and CAV supply systems | During construction | 4 |
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