What is the maximum allowable leakage rate for Class A duct sealing?

Under standard energy conservation codes and SMACNA leak test manuals, a high-pressure commercial duct system specified with a Class A Seal rating must restrict total air volume leakage to under 5% of the total system design CFM capacity when subjected to a full-pressure test verification run.

['Under standard energy conservation codes and SMACNA leak test manuals, a high-pressure commercial duct system specified with a Class A Seal rating must restrict total air volume leakage to under 5% of the total system design CFM capacity when subjected to a full-pressure test verification run.']

Stop if

• Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

Steps

• Stop and verify the approved detail, manufacturer instructions, foreman direction, and project specs before touching it.
• Under standard energy conservation codes and SMACNA leak test manuals, a high-pressure commercial duct system specified with a Class A Seal rating must restrict total air volume...

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