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Duct Leakage Test Report (HERS)

A Duct Leakage Test Report documents the results of a duct leakage test, typically performed as part of energy code compliance or HERS (Home Energy Rating System) verification. It measures the airtightness of the duct system using a duct blaster to ensure energy efficiency.

IECC, state energy codes, RESNET/HERS standards, ASHRAE 62.2Valid: One-off (no expiry)

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Sample Duct Leakage Test certificate

Sample Duct Leakage Test Report (HERS) certificate created with CertBox, showing the professional PDF layout with duct system details and location, test method and conditions, total leakage (cfm25)

Sample Duct Leakage Test with fictional data. All personal details shown are fake.

What it covers

  • Duct system details and location
  • Test method and conditions
  • Total leakage (CFM25)
  • Leakage to outside (CFM25)
  • Leakage rate as percentage
  • Pass/fail against code threshold

Who needs a Duct Leakage Test?

HVAC contractors
HERS raters
Building inspectors
Energy code compliance officers

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Frequently asked questions about Duct Leakage Test

What is an acceptable duct leakage rate?
The IECC typically requires total duct leakage no greater than 4 CFM25 per 100 square feet of conditioned floor area, or leakage to outside no greater than 8% of system airflow. Requirements vary by code edition and jurisdiction.
When is duct leakage testing required?
Most states adopting the 2012 IECC or later require duct leakage testing for new construction. Some jurisdictions also require it for duct replacements or major renovations. It is typically performed at rough-in and/or final stages.

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