DALT-T Passing Score 2026: Exactly What You Need to Pass

The Number: 25 of 32 Scored Questions

If you are searching for the DALT-T passing score, here is the short answer: the ICB Duct Air Leakage Testing Technician examination requires 25 correct answers out of 32 scored questions. That is the threshold that matters. The exam as delivered contains 40 questions in total, but eight of them are unscored beta items that ICB uses to evaluate questions for future use.

The credential discussed here is the International Certification Board (ICB) Duct Air Leakage Testing Technician certification. It is not any other credential that happens to share the same acronym, so figures you may have seen attached to other "DALT-T" programs should not be applied to this exam. Everything below comes from ICB's certification manual and associated exam documentation.

For a broader view of how this fits into the certification process, see our DALT-T requirements guide and the overview of what DALT-T certification is.

Anatomy of the 40-Question Exam

The structure of the exam shapes how you should think about the passing score. Here is how the 40 items break down:

The 2.5-hour figure comes from ICB's Certification Exam Details document (Version 2.6, identifier DS230815), which is hosted by providers such as the Southern California Sheet Metal JATC. It is a sourced written-exam duration. It is not a figure for training hours, and it should not be read as a practical-assessment allowance. It also is not a newly published 2026 revision; the document is simply the current source for the DALT time allowance.

Why the Beta Items Matter Psychologically

Eight unscored items out of 40 means 20% of what you read will not count toward your result. Since you cannot identify them, a question that feels unusually obscure or oddly worded may be a beta item, or it may be a scored item you simply need to work through carefully. The sound approach is to give every question honest effort, flag the hard ones, and keep moving rather than letting one difficult item drain your time.

What 25 of 32 Really Means for Your Margin

Doing the arithmetic on the scored portion: you can miss up to 7 of the 32 scored questions and still pass. Miss 8 and you fall short at 24 correct.

That margin is narrow enough to deserve respect but wide enough that a single weak area will not necessarily sink you. The key is that your misses are spread across an exam where the domains carry very different weights. A candidate who is strong in the heavily weighted domains can absorb gaps elsewhere, which is why understanding the weighting is the most practical use of the passing-score number.

If you are weighing how demanding this is, our companion piece on how hard the DALT-T exam is goes deeper on difficulty, and the DALT-T pass rate article explains what is and is not known about outcomes.

Where the Points Come From: Domain Weights

The seven domains are the official weighted knowledge-base headings for the exam. They are not equal, and the largest two dominate.

Applied to a 32-question scored set, these weights suggest roughly the following distribution, though ICB does not publish an exact per-domain question count, so treat these as approximations rather than guarantees: Fluid Flow around 7 questions, Instrumentation around 6, Specific Air Systems Procedures around 5, Math, Project Documents, and Considerations for DALT around 4 each, and Preliminary DALT Procedures around 3.

Together these two domains account for 40% of the exam. A candidate who masters them has a large head start on the 25-question target. For a full breakdown of every content area, see our complete guide to all seven DALT-T exam domains.

Preliminary DALT Procedures (9%) is the smallest domain, covering the groundwork before a test begins. Do not skip it just because it is small; with a margin of only seven misses, three easy questions are worth securing.

Format, Proctoring, and Reference Materials

The DALT-T is a proctored written examination. ICB-designated proctors administer it at designated sites, and it may be delivered online or on paper. Scheduling goes through your local JATC (Joint Apprenticeship and Training Committee).

One feature that distinguishes this exam from many certification tests: approved reference materials may be consulted, including on computers, tablets, or smartphones. Communication and capturing exam content are prohibited.

Because the rules on what counts as approved material are set by ICB and administered locally, confirm the specifics with your JATC before exam day rather than assuming. Our DALT-T study guide covers how to organize reference materials for quick use.

Getting to the Exam: Approval, Timing, and Retests

The passing score only matters once you are cleared to sit the exam. ICB approval comes before testing, and the written exam must be completed within one year of application approval.

Eligibility follows the technician categories in Section 3.2 of the ICB Certification Manual. These are alternative qualifying categories, meaning you need to fit one of them, not all:

• NEMIC contribution eligibility
• Qualifying SMART collective-bargaining work
• Specified circumstances of temporary unemployment or disability
• Temporary sheet-metal organizing employment

Details on qualifying are in our DALT-T requirements and eligibility guide, and the timing mechanics are covered in the exam dates and scheduling article.

What Happens If You Miss the Mark

If you score below 25 correct on the scored items, retesting is allowed after a waiting period that escalates:

These growing waits are a good reason to treat your first attempt seriously. A 30-day gap after one miss is manageable; repeated misses stretch the timeline considerably, and you still have the one-year completion window from application approval to keep in mind.

On cost, no current numerical DALT-T fee was verified in the materials this article draws on, so we will not quote one. For what is and is not known, see our DALT-T certification cost breakdown.

A Domain-Ordered Study Sequence

Rather than a generic schedule, order your preparation by weight and by dependency. Math underpins Fluid Flow and Instrumentation, so it comes first despite its modest weight. The sequence below is a suggestion built around the actual domain structure.

Training and ITI study-manual access are routed through your local JATC, per ICB's current technician instructions. For where to look, see our overview of DALT-T training. For a condensed final review, the DALT-T cheat sheet pulls together the must-know facts.

After You Pass: Validity and Renewal

Clearing 25 of 32 earns you a certification that is valid for two full years from the last day of the quarter in which it was obtained. To renew, you need to maintain eligibility, apply before expiration, and earn four acceptable ICB CEUs during the certification period.

One training hour equals one ICB CEU, and four total acceptable CEUs renew all technician certifications you hold. If you carry more than one ICB technician credential, a single set of four CEUs covers them all.

If you are considering what the credential does for your career, our articles on whether the certification is worth it, the salary guide, and DALT-T jobs are the next places to look.

What Is Not Published

A few facts people often want are not available in the retrieved ICB materials, and it is better to say so than to guess:

• A numerical exam fee: not verified for the DALT-T.
• An official pass-rate statistic: none was found, so any specific percentage you see quoted should be treated with skepticism.
• Exact per-domain question counts: ICB publishes weights, not guaranteed counts, so the distribution estimates above are approximations.

The version-control picture in ICB's documents is also slightly untidy. The certification manual cover reflects version 241024, approved October 24, 2024, while some internal elements carry older version labels. That does not change the 25-of-32 standard described here, but it is a reminder to confirm current details with your JATC or ICB before you test.

Frequently Asked Questions