Fall Semester 2026–2027 IICRC Fire and Smoke Restoration Technician
(FSRT) Certification Updated 2026 | 190+ Questions and Answers | IICRC
FSRT Study Guide, Practice Exam, Comprehensive Review, Exam Prep
Test Bank, Fire Damage Restoration, Smoke and Soot Removal, Odor
Control Techniques, Structural Cleaning, Restoration Procedures, Safety
Protocols, Contents Restoration, Disaster Recovery Operations, Detailed
Rationales and Complete Revision Material
Question 1: What are the three basic components required for a fire to ignite and
sustain itself, often referred to as the fire triangle?
A. Fuel, Nitrogen, and Carbon Dioxide
B. Fuel, Heat, and Oxygen
C. Heat, Oxygen, and a Chemical Chain Reaction
D. Carbon, Hydrogen, and Oxygen
CORRECT ANSWER: B. Fuel, Heat, and Oxygen
Rationale: The fire triangle consists of three essential elements: fuel, heat, and oxygen.
All three must be present for combustion to occur. Removing any one of these
components will extinguish the fire. Nitrogen and carbon dioxide are not components of
the fire triangle but are inert gases. The chemical chain reaction is an addition to the fire
triangle, forming the fire tetrahedron .
Question 2: Toxic materials can be released into the air during which of the
following restoration processes?
A. HEPA vacuuming and dry cleaning
B. Demolition and reconstruction
C. Thermal fogging and ozone treatment
D. Wet cleaning and chemical application
CORRECT ANSWER: B. Demolition and reconstruction
Rationale: Activities such as demolition and reconstruction can disturb hazardous
materials like lead, asbestos, and other toxic substances, releasing them into the air as
particulate matter. This requires proper safety protocols, including the use of PPE and
engineering controls to protect workers and occupants .
Question 3: What is the average size range of a smoke particulate, and how does
this influence its behavior?
A. 0.1 - 4 microns, allowing them to remain suspended in the air and penetrate deep
into porous materials
B. 10 - 50 microns, making them easily visible and quick to settle
C. 1 - 5 millimeters, which are easily filtered by standard masks
D. 5 - 10 nanometers, which are invisible but have no effect on indoor air quality
,CORRECT ANSWER: A. 0.1 - 4 microns, allowing them to remain suspended in the
air and penetrate deep into porous materials
Rationale: Smoke particles are extremely small, typically ranging from 0.1 to 4 microns
in size. This small size makes them lightweight and allows them to stay airborne for
extended periods and penetrate into the pores of materials, making them difficult to
remove and contributing to persistent odors .
Question 4: Smoke residue is commonly comprised of which of the following
elements?
A. Hydrogen and Oxygen
B. Carbon and Oxides of Nitrogen
C. Sodium Chloride and Sulfur
D. Lead and Asbestos
CORRECT ANSWER: B. Carbon and Oxides of Nitrogen
Rationale: Smoke is a by-product of incomplete combustion. It is commonly composed
of a complex mixture of particles, including carbon (soot) and various oxides of
nitrogen, along with other organic compounds. The specific composition varies
depending on the material that burned .
Question 5: When soot residue combines with moisture or high humidity, what is it
likely to form?
A. A harmless, water-soluble powder
B. An acid residue that can cause etching and corrosion
C. A hardened, cement-like substance
D. A type of mold that requires biocidal treatment
CORRECT ANSWER: B. An acid residue that can cause etching and corrosion
Rationale: Many combustion by-products, when combined with water (from humidity or
firefighting efforts), form acidic residues. These acids can cause significant damage to
surfaces like metal, glass, and painted finishes by etching them, making prompt and
proper cleaning essential .
Question 6: What is the primary factor that determines the temperature of a fire?
A. The amount of available oxygen
B. The color of the smoke produced
C. The volume of combustible materials
D. The humidity level of the surrounding air
CORRECT ANSWER: A. The amount of available oxygen
Rationale: The temperature of a fire is a direct function of the combustion rate, which is
largely controlled by the availability of oxygen. An oxygen-rich environment leads to a
,hotter, faster-burning fire, while a limited oxygen supply results in a cooler, smoldering
fire that produces more smoke and soot .
Question 7: Soot residues are known to gravitate or migrate to which type of
surfaces?
A. Rough, textured surfaces that trap debris
B. Cooler surfaces due to the movement of air and thermal dynamics
C. Heated surfaces where they can become baked on
D. Any surface, regardless of temperature, equally
CORRECT ANSWER: B. Cooler surfaces due to the movement of air and thermal
dynamics
Rationale: Smoke and soot particles are carried by convection currents—warm air rises
and cooler air sinks. As the heated smoke-laden air cools, it loses its ability to hold the
particulates, causing them to deposit on cooler surfaces like exterior walls, windows,
and metal fixtures .
Question 8: A by-product of incomplete combustion that is classified as a known
carcinogen is:
A. Carbon Dioxide (CO2)
B. Polycyclic Aromatic Hydrocarbons (PAH)
C. Sulfur Dioxide (SO2)
D. Nitrogen Dioxide (NO2)
CORRECT ANSWER: B. Polycyclic Aromatic Hydrocarbons (PAH)
Rationale: Polycyclic Aromatic Hydrocarbons (PAHs) are a class of chemicals that are
formed during the incomplete burning of organic substances like wood, coal, and oil.
Many PAHs are known to be, or are suspected to be, carcinogenic, making their removal
a critical safety concern during restoration .
Question 9: In the context of fire restoration, what does the insurance term "loss
mitigation" refer to?
A. Estimating the total cost of the property damage
B. Determining the cause and origin of the fire
C. Taking action to stop further damage to the property
D. Negotiating the final settlement with the adjuster
CORRECT ANSWER: C. Taking action to stop further damage to the property
Rationale: Loss mitigation refers to the immediate actions taken to prevent additional
damage after a loss event. In fire restoration, this includes activities like boarding up
windows, tarping roofs, and beginning water extraction to prevent further damage from
the elements or secondary issues like mold growth .
, Question 10: Which of the following types of soot residue is typically black, easily
smeared, and often results from the burning of plastics or rubber?
A. Protein residue
B. Dry wood soot
C. Plastic or rubber residue
D. Fuel-oil puff-back residue
CORRECT ANSWER: C. Plastic or rubber residue
Rationale: Fires involving synthetic materials like plastics and rubber burn at high
temperatures and produce a dense, oily, black soot that is difficult to clean. This soot is
characterized by its smeary nature and is often referred to as "wet" soot .
Question 11: A greasy soot residue that can be brown or yellow in color, often
produced by the combustion of meats and proteins, is known as:
A. Synthetic soot
B. Protein residue
C. Dry soot from wood
D. Inorganic residue
CORRECT ANSWER: B. Protein residue
Rationale: Protein fires, such as those from cooking meats or poultry, produce a greasy,
often nearly invisible residue that has a very pungent, penetrating odor. This residue can
have a yellowish or brownish tint and requires specific cleaning agents for effective
removal .
Question 12: Which type of soot residue is a result of a malfunction in an oil-fired
heating system?
A. Dry smoke residue from a fast, hot fire
B. Protein residue from a kitchen fire
C. Puff-back residue
D. Synthetic residue from a plastic fire
CORRECT ANSWER: C. Puff-back residue
Rationale: A puff-back is a malfunction in an oil-fired heating system (furnace or boiler)
that causes a mini-explosion, sending fine, oily soot throughout the property. This
residue is sticky, difficult to clean, and often requires specialized techniques .
Question 13: Which of the following soot residues typically requires damp cleaning
methods for effective removal?
A. Dry, powdery wood soot
B. Protein, plastic/rubber, and puff-back residues
C. Light, fluffy ash deposits
D. Soot from a high-temperature, clean-burning fire
(FSRT) Certification Updated 2026 | 190+ Questions and Answers | IICRC
FSRT Study Guide, Practice Exam, Comprehensive Review, Exam Prep
Test Bank, Fire Damage Restoration, Smoke and Soot Removal, Odor
Control Techniques, Structural Cleaning, Restoration Procedures, Safety
Protocols, Contents Restoration, Disaster Recovery Operations, Detailed
Rationales and Complete Revision Material
Question 1: What are the three basic components required for a fire to ignite and
sustain itself, often referred to as the fire triangle?
A. Fuel, Nitrogen, and Carbon Dioxide
B. Fuel, Heat, and Oxygen
C. Heat, Oxygen, and a Chemical Chain Reaction
D. Carbon, Hydrogen, and Oxygen
CORRECT ANSWER: B. Fuel, Heat, and Oxygen
Rationale: The fire triangle consists of three essential elements: fuel, heat, and oxygen.
All three must be present for combustion to occur. Removing any one of these
components will extinguish the fire. Nitrogen and carbon dioxide are not components of
the fire triangle but are inert gases. The chemical chain reaction is an addition to the fire
triangle, forming the fire tetrahedron .
Question 2: Toxic materials can be released into the air during which of the
following restoration processes?
A. HEPA vacuuming and dry cleaning
B. Demolition and reconstruction
C. Thermal fogging and ozone treatment
D. Wet cleaning and chemical application
CORRECT ANSWER: B. Demolition and reconstruction
Rationale: Activities such as demolition and reconstruction can disturb hazardous
materials like lead, asbestos, and other toxic substances, releasing them into the air as
particulate matter. This requires proper safety protocols, including the use of PPE and
engineering controls to protect workers and occupants .
Question 3: What is the average size range of a smoke particulate, and how does
this influence its behavior?
A. 0.1 - 4 microns, allowing them to remain suspended in the air and penetrate deep
into porous materials
B. 10 - 50 microns, making them easily visible and quick to settle
C. 1 - 5 millimeters, which are easily filtered by standard masks
D. 5 - 10 nanometers, which are invisible but have no effect on indoor air quality
,CORRECT ANSWER: A. 0.1 - 4 microns, allowing them to remain suspended in the
air and penetrate deep into porous materials
Rationale: Smoke particles are extremely small, typically ranging from 0.1 to 4 microns
in size. This small size makes them lightweight and allows them to stay airborne for
extended periods and penetrate into the pores of materials, making them difficult to
remove and contributing to persistent odors .
Question 4: Smoke residue is commonly comprised of which of the following
elements?
A. Hydrogen and Oxygen
B. Carbon and Oxides of Nitrogen
C. Sodium Chloride and Sulfur
D. Lead and Asbestos
CORRECT ANSWER: B. Carbon and Oxides of Nitrogen
Rationale: Smoke is a by-product of incomplete combustion. It is commonly composed
of a complex mixture of particles, including carbon (soot) and various oxides of
nitrogen, along with other organic compounds. The specific composition varies
depending on the material that burned .
Question 5: When soot residue combines with moisture or high humidity, what is it
likely to form?
A. A harmless, water-soluble powder
B. An acid residue that can cause etching and corrosion
C. A hardened, cement-like substance
D. A type of mold that requires biocidal treatment
CORRECT ANSWER: B. An acid residue that can cause etching and corrosion
Rationale: Many combustion by-products, when combined with water (from humidity or
firefighting efforts), form acidic residues. These acids can cause significant damage to
surfaces like metal, glass, and painted finishes by etching them, making prompt and
proper cleaning essential .
Question 6: What is the primary factor that determines the temperature of a fire?
A. The amount of available oxygen
B. The color of the smoke produced
C. The volume of combustible materials
D. The humidity level of the surrounding air
CORRECT ANSWER: A. The amount of available oxygen
Rationale: The temperature of a fire is a direct function of the combustion rate, which is
largely controlled by the availability of oxygen. An oxygen-rich environment leads to a
,hotter, faster-burning fire, while a limited oxygen supply results in a cooler, smoldering
fire that produces more smoke and soot .
Question 7: Soot residues are known to gravitate or migrate to which type of
surfaces?
A. Rough, textured surfaces that trap debris
B. Cooler surfaces due to the movement of air and thermal dynamics
C. Heated surfaces where they can become baked on
D. Any surface, regardless of temperature, equally
CORRECT ANSWER: B. Cooler surfaces due to the movement of air and thermal
dynamics
Rationale: Smoke and soot particles are carried by convection currents—warm air rises
and cooler air sinks. As the heated smoke-laden air cools, it loses its ability to hold the
particulates, causing them to deposit on cooler surfaces like exterior walls, windows,
and metal fixtures .
Question 8: A by-product of incomplete combustion that is classified as a known
carcinogen is:
A. Carbon Dioxide (CO2)
B. Polycyclic Aromatic Hydrocarbons (PAH)
C. Sulfur Dioxide (SO2)
D. Nitrogen Dioxide (NO2)
CORRECT ANSWER: B. Polycyclic Aromatic Hydrocarbons (PAH)
Rationale: Polycyclic Aromatic Hydrocarbons (PAHs) are a class of chemicals that are
formed during the incomplete burning of organic substances like wood, coal, and oil.
Many PAHs are known to be, or are suspected to be, carcinogenic, making their removal
a critical safety concern during restoration .
Question 9: In the context of fire restoration, what does the insurance term "loss
mitigation" refer to?
A. Estimating the total cost of the property damage
B. Determining the cause and origin of the fire
C. Taking action to stop further damage to the property
D. Negotiating the final settlement with the adjuster
CORRECT ANSWER: C. Taking action to stop further damage to the property
Rationale: Loss mitigation refers to the immediate actions taken to prevent additional
damage after a loss event. In fire restoration, this includes activities like boarding up
windows, tarping roofs, and beginning water extraction to prevent further damage from
the elements or secondary issues like mold growth .
, Question 10: Which of the following types of soot residue is typically black, easily
smeared, and often results from the burning of plastics or rubber?
A. Protein residue
B. Dry wood soot
C. Plastic or rubber residue
D. Fuel-oil puff-back residue
CORRECT ANSWER: C. Plastic or rubber residue
Rationale: Fires involving synthetic materials like plastics and rubber burn at high
temperatures and produce a dense, oily, black soot that is difficult to clean. This soot is
characterized by its smeary nature and is often referred to as "wet" soot .
Question 11: A greasy soot residue that can be brown or yellow in color, often
produced by the combustion of meats and proteins, is known as:
A. Synthetic soot
B. Protein residue
C. Dry soot from wood
D. Inorganic residue
CORRECT ANSWER: B. Protein residue
Rationale: Protein fires, such as those from cooking meats or poultry, produce a greasy,
often nearly invisible residue that has a very pungent, penetrating odor. This residue can
have a yellowish or brownish tint and requires specific cleaning agents for effective
removal .
Question 12: Which type of soot residue is a result of a malfunction in an oil-fired
heating system?
A. Dry smoke residue from a fast, hot fire
B. Protein residue from a kitchen fire
C. Puff-back residue
D. Synthetic residue from a plastic fire
CORRECT ANSWER: C. Puff-back residue
Rationale: A puff-back is a malfunction in an oil-fired heating system (furnace or boiler)
that causes a mini-explosion, sending fine, oily soot throughout the property. This
residue is sticky, difficult to clean, and often requires specialized techniques .
Question 13: Which of the following soot residues typically requires damp cleaning
methods for effective removal?
A. Dry, powdery wood soot
B. Protein, plastic/rubber, and puff-back residues
C. Light, fluffy ash deposits
D. Soot from a high-temperature, clean-burning fire
