Field glossary

Leakage class (CL)

Allowable leakage in cfm per 100 sq ft at 1 in. w.g.; a lower number is a tighter duct

Used across 3 Anvilfield field guides, most in HVAC.

Also defined as

Allowable leakage in cfm per 100 sq ft at 1 in w.g., used in F = CL x P^0.65

Where this shows up

HVACDuct leakage testing field guide HVACSheet metal duct fabrication field guide DatacenterDuct leakage pressure testing

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