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Duct Construction Specs: leakage class
CL6 Q2 to CL6 Q5
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 | leakage class (dimensionless) | leakage pct at 0p5 inwg (%) | leakage pct at 10 inwg (%) | leakage pct at 1 inwg (%) | leakage pct at 2 inwg (%) | leakage pct at 3 inwg (%) | leakage pct at 4 inwg (%) | leakage pct at 5 inwg (%) | leakage pct at 6 inwg (%) | leakage pct at 8 inwg (%) | qfan per as cfm per ft2 (cfm/ft2) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| leakage class | CL6 Q2 | 6 | 1.9 | 13.4 | 3 | 4.7 | 6.1 | 7.4 | 8.5 | 9.6 | 11.6 | 2 |
| leakage class | CL6 Q2p5 | 6 | 1.5 | 10.7 | 2.4 | 3.8 | 4.9 | 5.9 | 6.8 | 7.7 | 9.3 | 2.5 |
| leakage class | CL6 Q3 | 6 | 1.3 | 8.9 | 2 | 3.1 | 4.1 | 4.9 | 5.7 | 6.4 | 7.7 | 3 |
| leakage class | CL6 Q4 | 6 | 1 | 6.7 | 1.5 | 2.4 | 3.1 | 3.7 | 4.3 | 4.8 | 5.8 | 4 |
| leakage class | CL6 Q5 | 6 | 0.8 | 5.4 | 1.2 | 1.9 | 2.5 | 3 | 3.4 | 3.8 | 4.6 | 5 |
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