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Exam Review

Key Facts: CFEI Exam

100

Exam Questions

Multiple-choice & true/false

75%

Passing Score

75 of 100 questions

2 hrs

Time Limit

Closed-book exam

$135

Application Fee

Plus NAFI membership ($60/yr)

150

Application Credits

Minimum for exam eligibility

NFPA 921

Primary Reference

Guide for Fire & Explosion

The CFEI exam has 100 multiple-choice and true/false questions with a 2-hour time limit. A 75% score is required to pass. It is closed-book and based on NFPA 921. Administered by NAFI's National Certification Board, CFEI requires a credentials review before exam eligibility. NAFI membership ($60 per year) is required, and the non-refundable application fee is $135. The exam can be taken at NAFI training events, the NAFI office in Bradenton, FL, or via an approved proctor.

Sample CFEI Practice Questions

Try these sample questions to review concepts for the CFEI exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 110+ question experience with AI tutoring.

1What is the primary reference document for fire investigation methodology in the United States?
A.NFPA 1033
B.NFPA 921
C.OSHA 1910
D.IBC 2024
Explanation: NFPA 921, Guide for Fire and Explosion Investigations, is the primary reference document for fire investigation methodology. It provides a systematic approach to investigating fires and explosions using the scientific method. NFPA 1033 defines professional qualifications for fire investigators but does not outline investigative methodology.
2Which of the following best describes the fire tetrahedron?
A.Fuel, heat, oxygen, and water
B.Fuel, heat, oxygen, and a chemical chain reaction
C.Fuel, heat, carbon dioxide, and a chemical chain reaction
D.Fuel, ignition source, ventilation, and containment
Explanation: The fire tetrahedron consists of four elements: fuel, heat, oxygen, and an uninhibited chemical chain reaction. All four must be present for combustion to occur. Removing any one element will extinguish the fire. The fire triangle (fuel, heat, oxygen) was expanded to the tetrahedron to include the chemical chain reaction component.
3What investigative methodology does NFPA 921 recommend for fire and explosion investigations?
A.Deductive reasoning
B.The scientific method
C.Inductive reasoning only
D.Process of elimination
Explanation: NFPA 921 recommends the scientific method as the systematic approach for fire and explosion investigations. This includes recognizing the need, defining the problem, collecting data, analyzing the data, developing hypotheses, testing hypotheses, and selecting a final hypothesis. This method ensures objectivity and reproducibility in fire investigations.
4At approximately what temperature does flashover typically occur in a compartment fire?
A.200-300 degrees Fahrenheit
B.500-600 degrees Fahrenheit
C.900-1,100 degrees Fahrenheit
D.1,500-1,800 degrees Fahrenheit
Explanation: Flashover typically occurs when the upper gas layer temperature in a compartment reaches approximately 900-1,100 degrees Fahrenheit (500-600 degrees Celsius). At this point, all combustible materials in the compartment ignite nearly simultaneously due to radiant heat feedback from the hot gas layer, causing a rapid transition from a localized fire to full room involvement.
5What is the correct order of fire development stages in a compartment fire?
A.Growth, ignition, fully developed, decay
B.Ignition, growth, fully developed, decay
C.Ignition, flashover, growth, decay
D.Growth, flashover, fully developed, ignition
Explanation: The correct order of fire development in a compartment is ignition, growth, fully developed, and decay. Ignition is the initiation of combustion, the growth phase involves increasing fire size and intensity, the fully developed phase represents peak burning, and decay occurs as fuel is consumed or oxygen becomes limited.
6What type of heat transfer occurs through direct contact between two objects?
A.Radiation
B.Convection
C.Conduction
D.Pyrolysis
Explanation: Conduction is the transfer of heat through direct contact between objects or materials. The rate of conductive heat transfer depends on the thermal conductivity of the material, the cross-sectional area, and the temperature difference. Radiation transfers heat through electromagnetic waves, convection through the movement of heated fluids or gases, and pyrolysis is the chemical decomposition of materials by heat.
7An investigator discovers V-shaped fire patterns on a wall. What does this most likely indicate?
A.The fire burned slowly and at low temperature
B.An accelerant was used in that area
C.A plume of hot gases rose from a fire at or near the base of the V
D.The wall was exposed to radiant heat from across the room
Explanation: V-shaped burn patterns typically indicate the location where a fire plume interacted with a vertical surface. The base of the V-pattern generally points toward the lower area of fire origin or a fuel package. While V-patterns were historically associated with incendiary fires, NFPA 921 clarifies they can result from any fire and should not be used alone to determine fire cause.
8What is the autoignition temperature of a material?
A.The minimum temperature needed for a material to decompose
B.The lowest temperature at which a material ignites without an external ignition source
C.The temperature at which a material reaches its flash point
D.The maximum temperature a material can reach during combustion
Explanation: The autoignition temperature is the lowest temperature at which a combustible material will ignite spontaneously without an external ignition source such as a spark or flame. This is distinct from the flash point, which is the lowest temperature at which a liquid produces enough vapor to form an ignitable mixture with air near its surface when exposed to an ignition source.
9Which type of evidence is most susceptible to loss or contamination at a fire scene?
A.Structural steel beams
B.Volatile liquid residues
C.Concrete foundation samples
D.Metal electrical components
Explanation: Volatile liquid residues (potential ignitable liquids) are the most susceptible to loss or contamination at a fire scene. These residues can evaporate rapidly when exposed to air, heat, or sunlight. Investigators must collect samples as early as possible and store them in airtight, unlined metal cans or glass containers to preserve the evidence for laboratory analysis.
10What is the recommended container for collecting samples suspected of containing ignitable liquid residues?
A.Plastic zip-lock bags
B.Paper evidence bags
C.Clean, unlined metal cans with airtight lids
D.Glass jars without lids
Explanation: Clean, unlined metal cans with airtight lids are the recommended containers for collecting samples suspected of containing ignitable liquid residues. The airtight seal prevents evaporation of volatile compounds. Glass jars with airtight lids are also acceptable. Plastic bags and paper bags are not suitable because they allow volatile compounds to escape or may contaminate samples.

About the CFEI Exam

The CFEI (Certified Fire and Explosion Investigator) is the fire and explosion investigator certification awarded by NAFI. NAFI's CFEI Guidelines state that all questions on the 100-question closed-book exam are based on the current NFPA 1033 and taken from the current NFPA 921, Guide for Fire and Explosion Investigations; study areas include fire science, fire behavior, origin determination, cause determination, evidence collection, electrical investigation, building systems, legal considerations, and investigative methodology.

Exam sponsor: NAFI (National Association of Fire Investigators). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

100 questions

Time Limit

120 minutes

Passing Score

75% (75 of 100 questions)

Exam / Certification Fees

$135 application fee (plus required NAFI membership, $60 per year)

Exam sponsor website

Reported exam pass rate: Not publicly disclosed. NAFI does not publish pass rate data Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Not published

Fire Science and Chemistry

Fire tetrahedron, heat transfer, combustion, pyrolysis, flash point, autoignition temperature, combustion products

Not published

Fire Behavior and Dynamics

Compartment fire stages, flashover, backdraft, heat release rate, ventilation effects, thermal layering

Not published

Origin Determination

Fire patterns, V-patterns, char depth, calcination, arc mapping, scene examination, origin matrix

Not published

Cause Determination

Fire cause classification, ignition sources, incendiary indicators, negative corpus, first fuel ignited

Not published

Evidence Collection and Preservation

Chain of custody, ignitable liquid sampling, GC-MS analysis, ASTM standards, comparison samples

Not published

Electrical Fire Investigation

Short circuits, overcurrent, arc mapping, high-resistance connections, photovoltaic hazards

Not published

Building Systems and Construction

Construction types, sprinkler systems, smoke detectors, fire alarms, fire walls and barriers

Not published

Legal Considerations

Michigan v. Tyler, Daubert/Frye standards, expert testimony, search warrants, spoliation

Preparing for the CFEI Exam

What You Need to Know

  • Passing score: 75% (75 of 100 questions)
  • Exam length: 100 questions
  • Time limit: 120 minutes
  • Exam / certification fees: $135 application fee (plus required NAFI membership, $60 per year) Official sources

Using Our Practice Resources

  • Work through all 110 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

CFEI: Suggested Study Strategy

1Study NFPA 921 thoroughly — it is the primary reference for all exam questions; focus on the current 2024 edition
2Master the scientific method as applied to fire investigation: hypothesis development, testing, and elimination
3Know the four fire cause classifications (accidental, natural, incendiary, undetermined) and when each applies
4Understand fire dynamics: flashover temperature (~1,000 degrees F), stages of fire development, ventilation effects
5Learn evidence collection protocols: proper containers (unlined metal cans), chain of custody, comparison samples
6Review key legal cases: Michigan v. Tyler (warrantless entry), Daubert v. Merrell Dow (expert testimony)
7Study electrical fire causes: short circuits, overcurrent, arc mapping techniques, and high-resistance connections

Frequently Asked Questions

What is the CFEI certification?

The Certified Fire and Explosion Investigator (CFEI) is a professional certification from NAFI (National Association of Fire Investigators). It recognizes qualified professionals who investigate fire, arson, and explosion incidents. The certification is based on NFPA 921 scientific principles.

What is on the CFEI exam?

The CFEI exam consists of 100 randomly selected multiple-choice and true/false questions drawn from a pool maintained by the National Certification Board. All questions are based on NFPA 921 (Guide for Fire and Explosion Investigations) and NFPA 1033 (Standard for Professional Qualifications for Fire Investigator). The exam is closed-book with a 2-hour time limit.

What score do I need to pass the CFEI exam?

You need a minimum score of 75% (75 out of 100 questions) to pass the CFEI exam. Results are recorded as pass/fail only. NAFI's CFEI Guidelines say results are emailed within six weeks of NAFI's receipt of the completed exam.

What are the prerequisites for the CFEI?

You must be an active NAFI member and pass a credentials review demonstrating active involvement in fire and explosion investigation or related litigation. The application requires documentation of your qualifications. You also need a high school diploma or GED and at least 150 application credits, including the absolute minimums. Applications deemed incomplete will be returned, and those failing the credentials review will not be permitted to take the exam.

How much does CFEI certification cost?

The CFEI application fee is $135 (non-refundable, valid for one year from processing), and NAFI membership is required at $60 for one year ($110 for two years, $150 for three). Budget separately for current NFPA 921 and NFPA 1033 references and any optional training.

How does CFEI compare to IAAI-CFI?

CFEI from NAFI and IAAI-CFI from the International Association of Arson Investigators are both widely recognized fire investigator certifications, each with its own experience, training, and fee requirements. CFEI requires NAFI membership, 150 application credits, and a 100-question closed-book exam drawn from NFPA 921. Many investigators hold both credentials.