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Free CFEI Exam Prep

Certified Fire and Explosion Investigator (CFEI) Exam

Prepare for the CFEI exam without spending hundreds on expensive prep courses. Free study guides, practice questions, flashcards, and related exam resources.

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Your Study Path

CFEI Firefighter Certifications: Study Roadmap

Follow this path to organize your exam preparation

1

Phase 1: Fire Science FoundationsYou are here

Master fire chemistry, heat transfer, combustion, and fire dynamics fundamentals from NFPA 921.

25
hours
2

Phase 2: Origin and Cause Determination

Study fire pattern analysis, scene examination, ignition sources, and cause classification methods.

30
hours
3

Phase 3: Evidence, Legal, and Electrical

Learn evidence collection protocols, legal requirements, electrical fire investigation, and building systems.

25
hours
4

Phase 4: Practice Exams and Review

Complete timed practice exams, review weak areas, and build exam-day confidence.

20
hours
Estimated total study time
100 hours
That's about 10 weeks at 10 hours/week

Can You Take the CFEI Exam?

Check if you meet the basic eligibility requirements

Age
Education
High school diploma or GED required; a background in fire science, criminal justice, engineering, or a related field is recommended
Experience
Active involvement in fire and explosion investigation or related litigation is required; credentials review by NAFI's National Certification Board
Additional Requirements
  • •NAFI membership is required prior to applying for CFEI
  • •Application must be completed in full with original signature
  • •Credentials review must be approved before taking the exam
  • •Closed-book exam; no reference materials or outside assistance permitted

CFEI Quick Facts

Time to Get Licensed

8-12 weeks for most candidates

From start to license in hand

Exam Provider

NAFI National Certification Board (proctored at NAFI events, NAFI office, or by approved proctor)

In-Person Only
Schedule Your Exam

Retake Policy

Candidates who fail must wait six months after the original exam date to apply for a retest and must retest within 12 months of that date; after 12 months they must reapply. The $135 application fee is valid for one year from processing (NAFI CFEI Guidelines).

Total Cost Breakdown

Application Fee$135 non-refundable CFEI application fee, valid for one year from processing (may be reduced with a NAFI-sponsored training program)
Total Estimated Cost$195 minimum in the first year ($135 application fee + $60 one-year NAFI membership), plus reference books and any optional training
Why Choose Us

Free CFEI Prep Tools

Reported exam pass rate: NAFI does not publicly disclose CFEI exam pass rate statistics.. These figures describe exam candidates, not OpenExamPrep user outcomes. Check the exam sponsor’s website for published statistics.

100 Practice Questions

NFPA 921-based questions covering fire science, origin, cause, and evidence.

AI-Powered Learning

Targeted coaching for fire dynamics, evidence handling, and legal concepts.

2026 Updated

Review current NFPA 921 (2024 edition) and the current NFPA 1033.

Free Access

Start free CFEI practice — no credit card required.

Compare:
Kaplan $300+•Achievable $200+•OpenExamPrep $0

What You'll Study

14 chapters covering the exam topics in this guide

CFEI Exam Details

Certified Fire and Explosion Investigator (CFEI) Exam

Administered by NAFI (National Association of Fire Investigators)

Official Source
75% (75 of 100 questions)
Passing Score
100
Questions
2
Hours
$135 non-refundable CFEI application fee plus required NAFI membership ($60 for one year)
Exam Fee
Study time: 80-120 hours
Prerequisites: NAFI membership in good standing, a high school diploma or GED, at least 150 application credits including the absolute minimums, and active involvement in fire and explosion investigation (NAFI CFEI Guidelines)
Valid for: Recertify every five years with at least 40 continuing-education credits earned in the current five-year period, and keep NAFI membership current (NAFI).

Exam Content Breakdown

Based on the official NAFI (National Association of Fire Investigators) content outline

Fire Science and ChemistryNot published

Fire tetrahedron, heat transfer, combustion chemistry, pyrolysis, heat of combustion, fire load, stoichiometry, and combustion products.

Fire Behavior and DynamicsNot published

Compartment fire development, flashover, backdraft, heat release rate, ventilation effects, thermal layering, fire growth rate, and fuel-vs-ventilation controlled fires.

Origin DeterminationNot published

Fire patterns (V-patterns, pour patterns, clean burn, demarcation lines), char depth analysis, calcination, arc mapping, scene examination, and origin matrix.

Cause DeterminationNot published

Fire cause classification (accidental, natural, incendiary, undetermined), ignition sources, first fuel ignited, incendiary indicators, and negative corpus.

Evidence Collection and PreservationNot published

Evidence handling, chain of custody, ignitable liquid sampling, laboratory analysis (GC-MS, ASTM standards), comparison samples, and spoliation prevention.

Electrical Fire InvestigationNot published

Short circuits, overcurrent, ground faults, high-resistance connections, arc mapping, electrical system components, and photovoltaic system hazards.

Building Systems and ConstructionNot published

Construction types, fire protection systems (sprinklers, detectors, alarms), fire walls, fire barriers, fire dampers, and HVAC systems.

Legal ConsiderationsNot published

Search and seizure (Michigan v. Tyler), Daubert/Frye standards, expert testimony, standards of proof, spoliation, and insurance investigation.

Investigation Methodology and DocumentationNot published

Scientific method, hypothesis testing, scene safety, photography, scene diagrams, report writing, NFIRS, confirmation bias prevention, and interview techniques.

What's Included

14 Chapters

Complete exam coverage

Practice Quizzes

With detailed explanations

Free to Start

No credit card required

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What's Next After the CFEI?

After passing the CFEI, you can pursue these career paths

CFEI Exam FAQ

Official NAFI (National Association of Fire Investigators) Resources

Verify information with these official sources

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Ready to Start Your Free CFEI Prep?

Review the study guide, practice key concepts, and use the free tools at your own pace.