Sample data from Engineering Database — 375 reference tables, deterministic calculators, and Engineering AI. Sign up free
Duct Construction Specs: leakage class
CL3 Q2 to CL4 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 | CL3 Q2 | 3 | 1 | 6.7 | 1.5 | 2.4 | 3.1 | 3.7 | 4.3 | 4.8 | 5.8 | 2 |
| leakage class | CL3 Q2p5 | 3 | 0.8 | 5.4 | 1.2 | 1.9 | 2.5 | 3 | 3.4 | 3.8 | 4.6 | 2.5 |
| leakage class | CL3 Q3 | 3 | 0.6 | 4.5 | 1 | 1.6 | 2 | 2.5 | 2.8 | 3.2 | 3.9 | 3 |
| leakage class | CL3 Q4 | 3 | 0.5 | 3.4 | 0.8 | 1.2 | 1.5 | 1.8 | 2.1 | 2.4 | 2.9 | 4 |
| leakage class | CL3 Q5 | 3 | 0.4 | 2.7 | 0.6 | 0.9 | 1.2 | 1.5 | 1.7 | 1.9 | 2.3 | 5 |
| leakage class | CL4 Q2 | 4 | 1.3 | 8.9 | 2 | 3.1 | 4.1 | 4.9 | 5.7 | 6.4 | 7.7 | 2 |
| leakage class | CL4 Q2p5 | 4 | 1 | 7.1 | 1.6 | 2.5 | 3.3 | 3.9 | 4.6 | 5.1 | 6.2 | 2.5 |
| leakage class | CL4 Q3 | 4 | 0.8 | 6 | 1.3 | 2.1 | 2.7 | 3.3 | 3.8 | 4.3 | 5.2 | 3 |
| leakage class | CL4 Q4 | 4 | 0.6 | 4.5 | 1 | 1.6 | 2 | 2.5 | 2.8 | 3.2 | 3.9 | 4 |
| leakage class | CL4 Q5 | 4 | 0.5 | 3.6 | 0.8 | 1.3 | 1.6 | 2 | 2.3 | 2.6 | 3.1 | 5 |
What else is in Engineering Database
Iron Engine ↗Engineering AI at ironengine.ai
AI built for engineering. Searches the engineering database, performs calculations, gives source-backed engineering insights.
Get started for free ↗Reference Data375 engineering tablesMaterial properties, pipe and shape dimensions, code tables, and electrical ratings across mechanical, civil, chemical, electrical, materials, and manufacturing engineering.
Browse dataCalculatorsDeterministic engineering calculatorsSizing, checking, and conversion tools that run against the reference tables. Inputs are code-compliant, outputs are traceable to the source standard.
Browse calculators