Duct Construction Specs: system leakage
High pressure induction operating to VAV CAV return 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 | High pressure induction operating | 5 | High-pressure induction systems | Operating | — |
| system leakage | Multizone supply construction | 5 | Multizone supply, return, or exhaust systems | During construction | 2 |
| system leakage | Multizone supply operating | 5 | Multizone supply, return, or exhaust systems | Operating | — |
| system leakage | Single zone supply construction | 5 | Single-zone supply, return, or exhaust systems | During construction | 2 |
| system leakage | Single zone supply operating | 5 | Single-zone supply, return, or exhaust systems | Operating | — |
| system leakage | Supply return outdoors construction | 2 | Supply and return ductwork located outdoors | During construction | 3 |
| system leakage | Supply return outdoors operating | 2 | Supply and return ductwork located outdoors | Operating | — |
| system leakage | VAV CAV return downstream box construction | 5 | VAV or CAV return systems | During construction | 3 |
| system leakage | VAV CAV return operating | 5 | VAV or CAV return systems | Operating | — |
| system leakage | VAV CAV return upstream box construction | 5 | VAV or CAV return systems | During construction | 1 |
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