Duct Leakage Test SMACNA Class Acceptance
Duct Leakage Test SMACNA Class Acceptance template for recording test pressure, measured CFM leakage, and pass/fail against the design allowable. Use it to document acceptance, capture deficiencies, and get sign-off in one place.
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Overview
This template documents a duct leakage test against SMACNA class acceptance criteria for a specific duct section or system. It captures the project and system identifiers, the applicable leakage class or seal class, the design allowable leakage, the specified test pressure, the actual measured leakage, and the final pass/fail result. The form also records whether the test section was isolated and sealed, whether the test apparatus was calibrated and suitable, and whether access to test points was unobstructed.
Use it when a duct system must be accepted before turnover, concealment, or commissioning closeout. It is especially useful when the project specification requires a measurable leakage limit and a defensible field record. The template helps the inspector show not only the result, but also the conditions under which the result was obtained.
Do not use it as a general HVAC maintenance checklist or as a substitute for the project’s mechanical specifications. It is not meant for routine filter changes, airflow balancing, or equipment startup logs. If the duct section was not properly isolated, if the test pressure does not match the design requirement, or if the allowable leakage is not known, the test should be treated as incomplete rather than passed. The form is designed to surface those gaps clearly so they can be corrected and retested.
Standards & compliance context
- This template supports documentation commonly used under SMACNA leakage class practices and project specifications for duct construction and acceptance.
- It can be paired with mechanical code and commissioning requirements that call for verified duct tightness before concealment or turnover.
- Where smoke control or life-safety systems are involved, the record may also support review under NFPA-related requirements and AHJ acceptance processes.
- For projects with owner quality programs, the form provides a traceable non-conformance and corrective-action record consistent with ISO 9001-style documentation control.
General regulatory context for orientation only — verify current requirements with counsel or the relevant agency before relying on this template for compliance.
What's inside this template
Inspection Identification
This section ties the test to a specific project, system, date, and inspector so the result can be traced later without ambiguity.
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Project name / job number
Record the project name and internal job or work order number.
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System ID / duct section inspected
Identify the duct system, branch, zone, or test section covered by this record.
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Inspection date and time
Document when the leakage test was performed.
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Inspector name and company
Enter the qualified inspector or testing technician and company name.
Duct System and Design Criteria
This section defines the acceptance target, which is essential because leakage results only matter when matched to the correct class and design allowable.
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Duct system type
Select the duct system category being tested.
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SMACNA leakage class / seal class
Record the specified leakage class or seal class used to determine allowable leakage.
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Design allowable leakage (CFM)
Enter the maximum allowable leakage for the test section based on the project criteria.
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Test pressure specified by design
Record the required test pressure used to establish acceptance.
Test Setup and Preconditions
This section confirms the test was performed under valid conditions, which prevents false passes caused by poor isolation or unsuitable equipment.
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Test section isolated and sealed
Verify the duct section was isolated from the rest of the system and all openings were sealed for the test.
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Test apparatus calibrated and suitable for use
Confirm the leakage test equipment was calibrated and appropriate for the pressure range being measured.
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Ambient conditions recorded
Document relevant site conditions that could affect the test, such as temperature, wind, or access constraints.
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Access to test points unobstructed
Verify access to test ports, joints, and sealed openings was available for inspection.
Leakage Test Results
This section records the actual measured performance and the pass/fail decision that determines whether the duct section is acceptable.
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Actual test pressure
Record the pressure achieved during the leakage test.
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Measured leakage
Enter the measured leakage rate for the duct section at the test pressure.
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Leakage within allowable limit
Confirm the measured leakage does not exceed the design allowable leakage.
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Test result
Record the final acceptance outcome for the tested duct section.
Deficiencies, Corrective Actions, and Sign-Off
This section documents non-conformances, required fixes, and final approval so the record supports closeout and retest tracking.
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Deficiencies or non-conformances noted
Describe any leakage sources, sealing defects, access issues, or other non-conformances observed during the test.
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Corrective action required
Indicate whether repair, resealing, or retesting is required before acceptance.
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Inspector signature
Inspector attestation that the test record is accurate and complete.
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Owner / AHJ / commissioning representative sign-off
Optional acceptance acknowledgment by the owner, AHJ, or commissioning representative.
How to use this template
- Enter the project name, job number, system ID, inspection date and time, and the inspector’s name and company before starting the test.
- Record the duct system type, SMACNA leakage class or seal class, design allowable leakage, and the test pressure specified by the design documents.
- Verify and note that the test section is isolated and sealed, the test apparatus is calibrated and suitable, ambient conditions are recorded, and access to test points is unobstructed.
- Run the leakage test, then document the actual test pressure and measured leakage exactly as observed in the field.
- Compare the measured leakage to the allowable limit, mark the test result as pass or fail, and list any deficiencies or non-conformances that affected acceptance.
- Capture corrective actions, then obtain inspector signature and owner, AHJ, or commissioning representative sign-off after repairs or final acceptance.
Best practices
- Record the design allowable leakage before the test begins so the pass/fail decision is tied to the project requirement, not memory.
- Isolate and seal every opening in the test section before pressurizing, including temporary penetrations and access points that are easy to miss.
- Use a calibrated test apparatus and note the calibration status on the form so the result can be defended during review.
- Capture ambient conditions and test pressure at the time of the reading, especially when conditions could affect the stability of the test.
- Photograph the setup, test points, and any visible leakage paths while the test is in progress, not after the area has been disturbed.
- Treat any mismatch between specified test pressure and actual test pressure as a non-conformance, even if the measured leakage appears acceptable.
- Separate the leakage result from corrective action notes so a failed test is not mistaken for final acceptance.
What this template typically catches
Issues teams running this template most often surface in practice:
Common use cases
Frequently asked questions
What does this duct leakage test template cover?
It covers the core acceptance record for a duct leakage test: project and system identification, SMACNA leakage class or seal class, design allowable leakage, test pressure, measured leakage, and the final pass/fail result. It also includes preconditions and sign-off so the record shows the test was performed on an isolated, ready-to-test section. This makes it useful as both a field form and an acceptance document.
When should this template be used?
Use it when a duct section must be verified against a specified leakage class before turnover, commissioning, or closeout. It fits new construction, retrofit work, and corrective re-testing after sealing repairs. It is not a general HVAC maintenance log; it is meant for a specific acceptance test tied to design criteria.
Who should complete the duct leakage test record?
The inspector or test technician should complete the measurements and field observations, then the responsible contractor or commissioning representative should review the result. If the project requires it, the owner, AHJ, or commissioning authority can sign off on acceptance. The template works best when the person recording results is also the person verifying the test setup and calibration status.
How often is duct leakage testing performed?
It is typically performed at defined milestones rather than on a routine calendar. Common triggers are after duct installation, after sealing work, before insulation or concealment, and before final system acceptance. If a failed test leads to repairs, the same template can be reused for the retest and final acceptance record.
What standards or codes does this relate to?
This template is aligned with SMACNA leakage class acceptance practices and is commonly used alongside project specifications, mechanical codes, and commissioning requirements. Depending on the project, the record may also support owner quality requirements or AHJ review. It is not a substitute for the governing design documents, but it helps document compliance with them.
What are the most common mistakes when using this template?
Common mistakes include testing the wrong duct section, failing to isolate and seal all openings, using an unverified test apparatus, and recording leakage without the matching test pressure. Another frequent issue is leaving out the design allowable, which makes the pass/fail result hard to defend later. Photographing the setup and noting ambient conditions helps avoid disputes.
Can this template be customized for different duct systems?
Yes. You can adapt it for supply, return, exhaust, smoke control, or other duct systems by changing the system type field and the acceptance criteria. Many teams also add fields for duct size, insulation status, test medium, or repair notes. The key is to keep the measured leakage and allowable leakage fields tied to the project specification.
How does this compare with an ad hoc checklist or email approval?
An ad hoc checklist often misses the data needed to prove acceptance later, especially test pressure, allowable leakage, and who approved the result. This template creates a consistent record that is easier to review, audit, and attach to commissioning closeout packages. It also reduces rework by making deficiencies and corrective actions visible in the same form.
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