- What the Credential Actually Is
- Who Issues It and Who Hires for It
- The Exam: Format and Delivery
- The Five Examination Domains
- Eligibility and the Application Package
- Fees, Terms and Renewal
- Reading the Published Pass Ratio
- Sequencing Your Preparation by Domain
- CFST Versus Passing a State Licensing Exam
- Frequently Asked Questions
- CFST is the Council-certified Fire and Smoke Damage Technician credential, issued by the American Council for Accredited Certification (ACAC).
- The exam is 120 multiple-choice questions in 3 hours, closed-book, with a 75% passing score.
- Five domains are tested, from General Knowledge through Remediation; ACAC publishes no percentage weights.
- The first two-year term costs $500 in the US/Canada; renewal needs $400 and 40 recertification credits.
What the Credential Actually Is
The Council-certified Fire and Smoke Damage Technician (CFST) is a professional certification for people who investigate, sample, analyze and remediate the effects of combustion products on buildings and contents. It is not a general restoration badge and it is not a weekend course completion certificate. It is an exam-plus-experience credential: you must document real fire and smoke investigation work, submit project sheets, and pass a proctored written examination before the board will grant the designation.
If you have searched for the acronym and found other credentials that share the same letters, set those aside. This article concerns only the ACAC credential for fire and smoke damage work. For a shorter definitional overview, see What Is CFST? and What Does CFST Stand For?, and for the broader credential landscape see CFST Certification.
Who Issues It and Who Hires for It
The issuing body
The credential is issued by the American Council for Accredited Certification (ACAC). ACAC publishes a candidate handbook, an examination domains chart (approved March 20, 2024), a study and review guide (Rev. 12-2024), a fee schedule, recertification procedures and an annual exam pass ratio report. Those documents are the authoritative sources, and you should read them directly before you apply, because some details differ between documents. Those conflicts are flagged below.
Where the credential gets used
Fire and smoke damage work sits at the intersection of several employer types. Holders typically work for or contract with:
- Restoration and remediation firms that handle fire-loss projects and need documented investigative competence.
- Independent consulting practices that perform sampling, analysis and reporting on combustion-product contamination.
- Insurance-adjacent and claims-support roles where a defensible, third-party-recognized credential strengthens a scope-of-loss report.
- Environmental and industrial hygiene consultancies that add fire and smoke assessments to their service lines.
Because the credential requires documented investigations rather than just coursework, employers tend to read it as evidence of field experience. For a closer look at the labor market, see CFST Jobs, and for earnings context see the CFST Salary Guide and the ROI analysis on whether the certification is worth it.
The Exam: Format and Delivery
The examination is a closed-book written test. The specifics that matter for planning:
- Length: 120 multiple-choice questions.
- Answer choices: at least four options per item, so guessing is not a strategy.
- Time: 3 hours, which works out to roughly 90 seconds per question if you spend it evenly.
- Passing score: 75%, established using the modified Angoff method, a criterion-referenced approach in which subject-matter experts judge how a minimally competent candidate would perform on each item. Your result depends on meeting the standard, not on how other candidates scored. More detail is in CFST Passing Score.
- Provider and delivery: Kryterion, either at a testing center or through online video proctoring.
- Results: electronic scores are available immediately.
- Testing-center ID: two government-issued IDs, one of which must be a photo ID.
Because the test is closed-book and scenario-flavored, questions reward applied judgment: which sampling approach suits a given deposit, how to interpret a result against the site conditions, what remediation step follows from a finding. For a realistic sense of the challenge, read How Hard Is the CFST Exam?.
The Five Examination Domains
ACAC's examination domains chart lists five domains. No percentage weights appear in the chart or the handbook, so do not trust any source that claims to know how many questions come from each. Treat all five as examinable and prepare for each one. A full walkthrough lives in the CFST Exam Domains guide; here is what each domain asks of a working technician.
Domain 1: General Knowledge
The foundation: how fires produce residues and how those residues behave on building materials and contents.
- Combustion basics and the types of smoke and soot residues that result from different fuels and burn conditions
- How residues spread, adhere and react with surfaces over time
- Health and safety considerations for people working in fire-damaged structures
- Professional terminology and the role of the technician in a loss
Domain 2: Site Characterization
Before you sample anything, you have to understand the scene.
- Documenting the building, the origin and extent of damage, and the paths smoke and heat traveled
- Distinguishing affected from unaffected areas and identifying likely contamination gradients
- Forming a defensible investigation plan from what the site shows you
Domain 3: Sample Collection
Data quality is capped by sample quality.
- Selecting sampling methods suited to the material and the question being asked
- Choosing locations and numbers of samples, including controls or comparison areas
- Handling, labeling, preserving and documenting samples so they remain defensible
Domain 4: Sample Analysis, Data Interpretation & Report Writing
The domain that turns field work into a professional opinion.
- Understanding what analytical results can and cannot tell you
- Interpreting data against site observations rather than in isolation
- Structuring a report that states findings, limits and recommendations clearly
Domain 5: Remediation
Acting on the findings.
- Matching cleaning and restoration methods to surfaces and residue types
- Deciding what can be cleaned versus what should be removed or replaced
- Verifying results afterward and documenting that the work met its objective
The domain names above are the official ones; the bulleted topics describe the kind of competence each area targets. Use the ACAC study guide to confirm the exact subject matter before you build a study plan.
Eligibility and the Application Package
You cannot simply register and sit the exam. ACAC requires an application with documented qualifications, and certification requires unanimous board approval. The two eligibility routes are:
- A qualifying science-related two-year degree, or its 15-credit equivalent, plus one year of documented fire/smoke investigation experience; or
- A high-school diploma or GED plus two years of documented fire/smoke investigation experience.
The application package includes four project sheets, applicable education transcripts and required email verifications. No training course is mandatory, though many candidates take one to prepare; see CFST Training.
What counts as experience
The handbook accepts experience designing, conducting or reporting investigations of combustion-product damage. Unrelated water-damage, microbial-growth, asbestos, lead and other indoor environmental investigations do not qualify. If your background is mainly in those adjacent fields, you may need more fire and smoke work before you are eligible.
Applications and project sheets are handled through ACAC's fire and smoke application page, and the official CFST application form is linked from the handbook materials. For a fuller breakdown, read CFST Requirements, and for scheduling questions see CFST Exam Dates.
Fees, Terms and Renewal
| Item | Amount / Rule |
|---|---|
| Examination fee | $100 |
| Certification fee | $400 |
| First two-year term, US/Canada | $500 total |
| First two-year term, outside US/Canada | $525 |
| Retake | $100 |
| Validity | Two years |
| Renewal | $400 plus 40 recertification credits |
The 40 recertification credits break down as 10 credits for attesting to continued field activity plus 30 hours of professional development. Keep your documentation, because ACAC may audit it. Procedures are on ACAC's recertification page. For the complete financial picture, including what to budget beyond the ACAC fees, see CFST Certification Cost.
Key Takeaway
Budget for the credential as a recurring commitment, not a one-time purchase. The $400 renewal and the 30 professional development hours recur every two years, so start logging qualifying activity from the day you are certified.
Reading the Published Pass Ratio
ACAC's 2025 Exam Pass Ratio report shows 66%, with 10 passing out of 15 examinations. That figure preserves the issuer's printed number, but read it carefully:
- The sample is small: 15 examinations in total, so a single result moves the percentage substantially.
- The report includes retakes and state-licensing-only examinations, so it is not a first-attempt pass rate.
- It is not a prediction of your own outcome, which depends on your preparation and experience.
Treat it as a loose indicator that the exam is passable but not trivial. A deeper discussion is in CFST Pass Rate.
Sequencing Your Preparation by Domain
This is the one place generic planning belongs, and it is tied to the CFST domains. The order below follows how a real investigation unfolds, which also happens to build knowledge cumulatively. Adjust the pacing to your own timeline and the ACAC study guide; the full method is in the CFST Study Guide.
General Knowledge first
- Everything else leans on residue and combustion fundamentals
- Read the ACAC study guide front to back once for orientation
Site Characterization and Sample Collection together
- These are sequential in the field, so study them as one workflow
- Practice reasoning from a described scene to a sampling plan
Analysis, Interpretation and Reporting
- Spend extra time here; interpretation questions test judgment, not recall
Remediation, then full-length practice
- Close with remediation, then take timed 120-question practice sets on the CFST practice test site
- Review missed items by domain to find weak areas
For a compact last-minute review, the CFST Cheat Sheet condenses must-know facts. When you are ready to test yourself under exam-like conditions, try the CFST Exam Prep practice questions.
CFST Versus Passing a State Licensing Exam
Some states use the ACAC examination as part of licensing for fire and smoke work. That creates a common misunderstanding: passing the exam for licensing purposes does not confer the CFST designation. The designation requires the full application, the documented experience, the project sheets and board approval.
| Path | What you complete | Result |
|---|---|---|
| State licensing only | Pass the examination as required by the state | Meets the licensing requirement; no CFST designation |
| CFST certification | Application, experience documentation, four project sheets, transcripts, email verifications, exam, and unanimous board approval | CFST designation for a two-year term |
If you are unsure which path you need, check your state's requirements and your employer's expectations before paying any fees. Further definitional background is available in What Is A CFST?, CFST Meaning, What Does CFST Mean? and What Is CFST Certification?.
Frequently Asked Questions
It stands for Council-certified Fire and Smoke Damage Technician, a credential issued by the American Council for Accredited Certification (ACAC) for professionals who investigate and remediate fire and smoke damage.
The exam has 120 multiple-choice questions with at least four answer choices each, given over 3 hours in a closed-book format. The passing score is 75%, set using the modified Angoff method.
No. ACAC does not mandate a training course. You do need to meet the education and documented experience requirements and submit four project sheets, transcripts and email verifications with your application.
Certification is valid for two years. Renewal costs $400 and requires 40 recertification credits: 10 for attesting to continued field activity and 30 hours of professional development. Keep documentation in case of audit.
No. The handbook states that unrelated water-damage, microbial-growth, asbestos, lead and other indoor environmental investigations do not qualify. Your documented experience must involve investigating combustion-product damage.