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Exam Review

Key Facts: IAAI-FIT Exam

50

Selected-Response Questions

firearson.com IAAI-FIT page

70%

Passing Score

firearson.com IAAI-FIT page

2 / 90 days

Attempts in Exam Window

firearson.com IAAI-FIT page

18 months

Required Experience

firearson.com IAAI-FIT page

54 hours

Tested Training Required

firearson.com IAAI-FIT page

5 years

Recertification Cycle

firearson.com IAAI-FIT page

80 hours

Renewal Training

firearson.com IAAI-FIT page

40 hours

Fundamentals Course

firearson.com IAAI-FIT page

IAAI-FIT is the foundational IAAI fire-investigation credential. The exam is 50 selected-response questions delivered online via CFITrainer.net with a 70% passing score and two attempts allowed inside a 90-day window. Eligibility requires 18 months of general fire-investigation-related experience and 54 tested training hours (including the 40-hour IAAI Fundamentals of Fire Investigation Course and five required CFITrainer.Net modules). The credential is renewed on a 5-year cycle requiring 36 months of additional experience and 80 hours of continuing fire-investigation training and education — no exam retake. FIT is distinct from IAAI-CFI: FIT validates entry-level scene-technician knowledge; CFI is the full Certified Fire Investigator credential with a higher experience bar and a proctored peer-reviewed exam.

Sample IAAI-FIT Practice Questions

Try these sample questions to review concepts for the IAAI-FIT exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which document is the primary methodology guide an IAAI-FIT candidate must apply when reconstructing a fire scene?
A.NFPA 1 Fire Code
B.NFPA 921 Guide for Fire and Explosion Investigations
C.NFPA 13 Standard for Installation of Sprinkler Systems
D.OSHA 29 CFR 1910 Subpart Z
Explanation: NFPA 921 is the consensus guide that codifies the scientific method for fire and explosion investigations and is the document referenced throughout the IAAI-FIT and IAAI-CFI exams. NFPA 1033 specifies the professional qualifications, but the methodology a FIT applies in the field is from NFPA 921.
2Which standard establishes the professional qualifications and job performance requirements (JPRs) for a fire investigator?
A.NFPA 921
B.NFPA 1033
C.NFPA 472
D.NFPA 1500
Explanation: NFPA 1033 Standard for Professional Qualifications for Fire Investigator (2022 ed.) defines the JPRs and the 16 knowledge areas the investigator must remain current on. NFPA 921 is the methodology guide; the two are intentionally paired.
3Per NFPA 921, the scientific method begins by:
A.Forming a final opinion before evidence collection
B.Recognizing the need and defining the problem
C.Reporting the cause to the property owner
D.Selecting an ignition source from common causes
Explanation: The NFPA 921 scientific method starts with recognizing the need (a fire occurred) and defining the problem (what was the origin and cause). Data collection, hypothesis formation, hypothesis testing, and final hypothesis selection follow.
4Which of the following best describes the components of the fire tetrahedron?
A.Heat, fuel, oxidizer, and an uninhibited chemical chain reaction
B.Heat, smoke, fuel, and water
C.Oxygen, gasoline, ignition, and ventilation
D.Combustion, conduction, convection, and radiation
Explanation: The fire tetrahedron consists of heat (energy), fuel, an oxidizing agent, and an uninhibited self-sustaining chemical chain reaction. Removing any leg extinguishes the fire — the basis for most extinguishing techniques.
5Which mode of heat transfer is most responsible for igniting target fuels separated from the burning item across an air gap?
A.Conduction
B.Convection
C.Radiation
D.Direct flame impingement
Explanation: Radiation is electromagnetic energy that crosses air without a medium and is the dominant mechanism for igniting non-contact target fuels. NFPA 921 chapter 5 explicitly identifies radiant heat from the hot upper layer and flames as the primary driver of remote ignition leading to flashover.
6Flashover, per NFPA 921, is best described as:
A.The sudden ignition of unburned gases trapped in a void
B.A transition during which surfaces exposed to thermal radiation reach ignition near simultaneously
C.The collapse of a load-bearing wall during fire suppression
D.A backdraft following oxygen reintroduction
Explanation: NFPA 921 defines flashover as a transition phase in compartment fire development in which surfaces exposed to thermal radiation reach ignition temperature more or less simultaneously and fire spreads rapidly throughout the space. It is preceded by upper-layer temperatures of roughly 500-600 C.
7A backdraft is most likely to occur when:
A.An open-air fire is rapidly extinguished by water spray
B.A small kitchen fire is contained by a closed door for 30 seconds
C.A ventilation-limited fire is rapidly re-aerated, allowing accumulated hot fuel-rich gases to find oxygen
D.Sprinklers activate and reduce upper-layer temperatures
Explanation: Backdraft requires a hot, fuel-rich, oxygen-deficient compartment that is then re-aerated (a door opened, window failure). Rapid oxidation of the accumulated unburned gases produces the characteristic deflagration and overpressure described in NFPA 921 chapter 5.
8A 'ventilation-limited' compartment fire is one in which:
A.Fuel mass remaining limits heat release
B.Available air (oxygen) limits heat release
C.Sprinkler activation limits heat release
D.Wind direction outside limits heat release
Explanation: A ventilation-limited (sometimes 'under-ventilated') fire has more fuel available than the compartment air supply can support. Heat release rate is then controlled by available oxygen. NFPA 921 chapter 5 explicitly distinguishes fuel-limited from ventilation-limited regimes.
9Thermal layering (stratification) in a compartment refers to:
A.The deposition of carbon particles on cold surfaces
B.The arrangement of hot gases above cooler air due to buoyancy
C.The sequence in which finishes ignite
D.Char layer formation on wood
Explanation: Hot gases are less dense than cool air and rise, creating an upper hot layer and a cooler lower layer separated by an interface. Disturbing the layer (improper ventilation) is a recognized firefighter hazard.
10An 'hourglass' fire pattern on a wall typically indicates:
A.A fire that originated above the ceiling
B.Flame impingement on the wall with the narrowest point near the base of the flame plume
C.Spalling from a hose stream
D.Calcination only on the upper portion of the wall
Explanation: An hourglass pattern is created by the inverted-cone base of the flame plume and the outwardly expanding plume above; the narrow waist marks where the plume necks down near the base. NFPA 921 chapter 6 documents this and the V- and U-shaped variants.

About the IAAI-FIT Exam

The IAAI Fire Investigation Technician (IAAI-FIT) is the foundational IAAI credential for fire-scene technicians and entry-level investigators. The 50-question selected-response exam is delivered online through CFITrainer.net after IAAI committee approval of the application. Candidates must hold 18 months of general experience in a fire investigation-related agency or industry plus 54 tested training hours that include the 40-hour IAAI Fundamentals of Fire Investigation Course and five required CFITrainer.Net modules.

Exam sponsor: International Association of Arson Investigators (IAAI), delivered online via CFITrainer.net. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

100 questions

Time Limit

Two attempts within a 90-day window

Passing Score

70% or above

Exam / Certification Fees

Application fee set by IAAI; member discount available (verify on firearson.com)

Exam sponsor website

Reported exam pass rate: Not published. IAAI does not publish first-time IAAI-FIT pass-rate percentages. 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.

Heavy

NFPA 921 Methodology and Scientific Method

Applying the scientific method, working hypotheses, and the seven-step NFPA 921 methodology to fire and explosion investigations.

Heavy

Fire Dynamics and Heat Transfer

Combustion chemistry, fire tetrahedron, conduction/convection/radiation, thermal layering, flashover, rollover, backdraft, ventilation-limited burning.

Heavy

Fire Patterns and Origin Determination

V, U, hourglass, columnar, and full-room patterns; calcination, spalling, annealing, char depth; area vs point of origin.

Moderate

Cause Determination and Ignition Sources

NFPA 921 cause classification (accidental, natural, incendiary, undetermined); open-flame, electrical, mechanical, chemical, smoking, spontaneous heating.

Moderate

Evidence Collection and ASTM Methods

ASTM E1188, E1412, E1413, E1459, E1492, E1618; ignitable liquid residue (ILR) classification; chain of custody.

Moderate

Scene Safety, Hazmat, and Legal Foundations

PPE per 29 CFR 1910.134/1910.156, 4-gas monitoring, HAZWOPER awareness, Michigan v Tyler/Clifford, Daubert/FRE 702, IAAI Code of Ethics.

Light

Specialty Scenes

Vehicle (NFPA 921 ch. 27) and wildland (NFPA 921 ch. 28) fire investigation basics.

Preparing for the IAAI-FIT Exam

What You Need to Know

  • Passing score: 70% or above
  • Exam length: 100 questions
  • Time limit: Two attempts within a 90-day window
  • Exam / certification fees: Application fee set by IAAI; member discount available (verify on firearson.com) Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

IAAI-FIT: Suggested Study Strategy

1Read NFPA 921 (2024) chapters 4 (Methodology), 5 (Basic Fire Science), 6 (Fire Patterns), and 18 (Origin Determination) cover to cover before drilling practice questions.
2Memorize the seven-step NFPA 921 methodology and the scientific method steps; expect direct recall items asking you to order or identify them.
3Drill ignitable liquid residue (ILR) classification per ASTM E1618: gasoline, petroleum distillates, isoparaffinic, naphthenic-paraffinic, normal alkanes, aromatic, and oxygenates.
4Know each fire-effect indicator and its formation mechanism — calcination of gypsum, spalling of concrete, annealing of springs, and depth-of-char survey methodology.
5Memorize Michigan v Tyler (1978) and Michigan v Clifford (1984) — when an administrative warrant is sufficient versus when a criminal search warrant is required at fire scenes.
6Practice scene-safety questions on PPE, SCBA vs APR vs particulate filter selection, 4-gas monitoring (CO/H2S/O2/LEL), and HAZWOPER awareness level under 29 CFR 1910.120.
7Train on the NFPA 921 cause classification quartet — accidental, natural, incendiary, undetermined — and the conditions that justify each.
8Complete the 40-hour IAAI Fundamentals of Fire Investigation Course and the five required CFITrainer.Net modules before applying; these are exam prerequisites and tested-training requirements.

Frequently Asked Questions

What is the IAAI-FIT credential?

The IAAI Fire Investigation Technician (IAAI-FIT) is the International Association of Arson Investigators' foundational credential for fire-scene technicians and entry-level investigators. It validates baseline knowledge of NFPA 921, NFPA 1033, fire dynamics, patterns, evidence, and scene safety.

How is the IAAI-FIT exam different from the IAAI-CFI exam?

IAAI-FIT is the foundational scene-technician credential — a 50-question online exam delivered via CFITrainer.net with an 18-month experience prerequisite. IAAI-CFI is the full Certified Fire Investigator credential with a higher experience bar, a more rigorous proctored exam, and a peer-review component.

How many questions are on the IAAI-FIT exam?

The official IAAI-FIT exam contains 50 selected-response questions delivered online via CFITrainer.net. This practice bank provides 100 study questions so you can drill weak topics before scheduling your real attempts.

What is the passing score on the IAAI-FIT exam?

Candidates must score 70% or above to pass the IAAI-FIT exam, per the IAAI credential page on firearson.com.

How many attempts do I get on the IAAI-FIT exam?

Approved candidates receive two attempts within a 90-day exam window. If both attempts fail, a new application and fee are required to re-test.

What experience and training do I need to apply for IAAI-FIT?

A minimum of 18 months of general experience in a fire investigation-related agency or industry plus 54 tested training hours, including the 40-hour IAAI Fundamentals of Fire Investigation Course and five required CFITrainer.Net modules totaling 14 hours.

How is IAAI-FIT renewed?

IAAI-FIT renews on a 5-year cycle. You must document 36 months of additional general work experience and 80 hours of fire-investigation-related training and education over the cycle, up to 10% of which may be untested. No exam retake is required for renewal.

Is IAAI-FIT a prerequisite for IAAI-CFI?

No. IAAI-FIT is not a prerequisite for IAAI-CFI; the two are separate credentials with different experience and exam requirements. Many investigators earn FIT first as a stepping stone, but it is not required to apply for CFI.

Where is the IAAI-FIT exam delivered?

The IAAI-FIT exam is delivered online through CFITrainer.net once the IAAI credential committee has reviewed and approved the candidate application.

Which NFPA editions does IAAI-FIT cover?

IAAI-FIT references the current editions of NFPA 921 (Guide for Fire and Explosion Investigations, 2024 edition) and NFPA 1033 (Standard for Professional Qualifications for Fire Investigator, 2022 edition). Confirm current editions on firearson.com before testing.