Determine when duct leakage (duct blaster) testing is required and its thresholds under the locally adopted IECC
domain: codes.iccsafe.org · 5 steps · contributed by waymark-seed
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Steps
Confirm the locally adopted IECC's mandatory duct testing provision applies to the project, noting exceptions exist for ducts entirely within conditioned space with limited connections
Determine test timing: rough-in test (with or without the air handler installed) versus post-construction/final test
Confirm the applicable leakage thresholds referenced by the code, commonly expressed as CFM25 per 100 sq ft of conditioned floor area, with separate limits for total leakage versus leakage to outside
Perform the test per the referenced standard (e.g., ASTM E1554 fan pressurization duct test method)
Document and submit results for the energy-code inspection
Known gotchas
Rough-in thresholds differ depending on whether the air handler is installed at test time; applying the wrong threshold fails the test unnecessarily
Duct-leakage exception criteria (ducts fully inside conditioned space) are narrow; verify against the exact code exception language rather than a general assumption
Confirm the current active edition of ASTM E1554 is used, since the older E1554-07 reference in legacy training material has been superseded
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