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Firefighter Certification practice questions

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Question 1Fire Service Orientation, Safety, and Health

Under the Incident Command System, who has overall responsibility for managing an incident, including setting objectives and approving the incident action plan?

  1. Safety Officer
  2. Operations Section Chief
  3. Planning Section Chief
  4. Incident Commander Correct answer.

Explanation

The Incident Command System vests ultimate authority and accountability in a single Incident Commander, who establishes objectives, approves the incident action plan, and manages the overall incident. All command staff and section chiefs operate under that authority with narrower assignments.

Question 2Fire Service Orientation, Safety, and Health

Under the two-in/two-out rule, the two firefighters stationed outside an IDLH atmosphere must be able to:

  1. complete the incident report after the fire
  2. enter immediately to rescue the interior crew Correct answer.
  3. direct traffic around the scene
  4. operate the pump panel for the attack lines

Explanation

OSHA respiratory protection rules require at least two members inside the IDLH atmosphere and at least two members outside who are equipped with PPE and SCBA and capable of entering without delay to rescue the interior crew. This standby capability is what makes interior attack permissible.

Question 3Fire Service Orientation, Safety, and Health

When must a firefighter perform a facepiece seal check on an SCBA?

  1. Each time the facepiece is donned Correct answer.
  2. Once during initial training
  3. Only during annual fit testing
  4. Only after the unit has been repaired

Explanation

A seal check confirms there is no leakage between the face and the facepiece, and the seal depends on current conditions such as strap tension, mask condition, and the presence of facial hair. Because those conditions change, the check must be repeated every time the facepiece is put on.

Question 4Fire Service Orientation, Safety, and Health

Which NFPA standard specifies minimum design and performance requirements for the structural firefighting protective ensemble?

  1. NFPA 1971 Correct answer.
  2. NFPA 1977
  3. NFPA 1999
  4. NFPA 1981

Explanation

NFPA 1971 covers the structural firefighting protective ensemble, including coat, trousers, helmet, gloves, hood, and footwear. The other standards address wildland clothing, breathing apparatus, and emergency medical protective clothing respectively.

Question 5Fire Service Orientation, Safety, and Health

Which individual is credited with organizing the Union Fire Company, one of the earliest volunteer fire companies in the American colonies?

  1. Thomas Jefferson
  2. Benjamin Franklin Correct answer.
  3. Paul Revere
  4. George Washington

Explanation

Benjamin Franklin organized the Union Fire Company in Philadelphia in 1736, an early example of organized volunteer firefighting in the colonies, and he also helped establish one of the first fire insurance companies there. This tradition of organized volunteer companies shaped the American fire service.

Question 6Fire Service Orientation, Safety, and Health

A company officer receives a radio request for a personnel accountability report (PAR). What does the officer report?

  1. The number of apparatus on scene
  2. The water supply status for the company
  3. The estimated time to extinguishment
  4. That all assigned members are accounted for Correct answer.

Explanation

A personnel accountability report is a roll-call confirmation that every member assigned to a company or sector is accounted for, with the officer reporting PAR once all members are confirmed. A member who cannot be accounted for triggers immediate search efforts and MAYDAY procedures.

Question 7Fire Service Orientation, Safety, and Health

What is the primary purpose of establishing a rehabilitation sector at a working incident?

  1. To process media requests for information
  2. To store reserve SCBA cylinders
  3. To reduce heat stress and fatigue in members Correct answer.
  4. To interview witnesses about the cause

Explanation

Rehabilitation provides rest, cooling, hydration, nourishment, and medical monitoring so that accumulated heat stress and cardiovascular strain are reversed before members return to duty. Members who have not adequately recovered should not be reassigned to strenuous work.

Question 8Fire Service Orientation, Safety, and Health

Which practice best reduces a firefighter's exposure to cancer-causing contaminants after firefighting operations?

  1. Washing the face and hands only at the end of the shift
  2. Storing turnout gear in the sleeping quarters
  3. Wearing the same PPE for consecutive incidents
  4. Cleaning skin and bagging gear at the scene Correct answer.

Explanation

Soot on skin and equipment carries combustion products that can be absorbed or inhaled, so skin decontamination at the scene and bagging contaminated gear reduces both direct exposure and cross-contamination of apparatus cabs and living areas. Gear should then be laundered in a dedicated extractor rather than taken into quarters.

Question 9Fire Service Orientation, Safety, and Health

Where must firefighters be positioned while a fire apparatus is in motion?

  1. Seated and belted inside the cab Correct answer.
  2. On the side running boards
  3. Standing on the rear step
  4. In the hose bed area

Explanation

Members must ride seated and secured with seat belts inside the cab, and apparatus should not move until all members are seated and belted. Riding outside the cab or unbelted is a major contributor to firefighter injuries and deaths in vehicle crashes.

Question 10Fire Service Orientation, Safety, and Health

Crash data for emergency vehicles indicates that the greatest risk of collision during an emergency response occurs:

  1. on straight residential streets
  2. on limited-access highways
  3. at intersections Correct answer.
  4. inside apparatus bays

Explanation

Intersections concentrate conflicting traffic, signals, pedestrians, and turning movements, and other drivers frequently fail to yield to emergency vehicles, so most apparatus collisions occur there. Drivers must slow and stop as needed to confirm the way is clear before proceeding.

Question 11Fire Service Orientation, Safety, and Health

Which behavior is most consistent with a firefighter experiencing cumulative stress?

  1. Asking for feedback on performance
  2. Withdrawing from the crew Correct answer.
  3. Arriving early for shift
  4. Volunteering for extra training

Explanation

Cumulative stress commonly appears as withdrawal from coworkers, irritability, sleep disturbance, and loss of interest in work and outside activities, and these serve as early warning signs. Peer support and employee assistance resources allow intervention before performance or health declines.

Question 12Fire Service Orientation, Safety, and Health

During an inspection, a firefighter finds a torn outer shell and a cracked helmet. What is the correct action?

  1. Remove the items from service and tag them Correct answer.
  2. Repair the shell with duct tape and keep it in service
  3. Swap the damaged items with another member's spare gear
  4. Continue using the gear until the next annual inspection

Explanation

Damaged elements of the protective ensemble may no longer provide the designed protection, so they must be removed from service, tagged, and repaired or replaced according to the manufacturer's instructions and NFPA 1851. Informal field repairs and undocumented swaps undermine the inspection and repair record.

Question 13Fire Service Orientation, Safety, and Health

Which NFPA standard provides the framework for a fire department health-related fitness program?

  1. NFPA 1500
  2. NFPA 1001
  3. NFPA 1971
  4. NFPA 1583 Correct answer.

Explanation

NFPA 1583 covers health-related fitness programs, including fitness assessment, individual exercise programs, and health promotion for members. The companion standards address medical requirements, the occupational safety and health program, and protective equipment.

Question 14Fire Service Orientation, Safety, and Health

According to NFPA 1404, the SCBA low-air alarm must activate at approximately what point in the air supply?

  1. 10 percent remaining
  2. 50 percent remaining
  3. 25 percent remaining
  4. 33 percent remaining Correct answer.

Explanation

NFPA 1404 requires the low-air alarm to sound when the cylinder reaches about one-third of its capacity, leaving enough reserve air for the member to exit. Members should already be withdrawing at the point of no return rather than waiting for the alarm.

Question 15Fire Service Orientation, Safety, and Health

A MAYDAY is transmitted on the fireground tactical channel. How should other units respond?

  1. Switch all units to a new channel immediately
  2. Keep the channel clear for rescue traffic Correct answer.
  3. Broadcast a status check on the same channel
  4. Repeat the MAYDAY to confirm the location

Explanation

When a MAYDAY is declared, the Incident Commander typically clears or reassigns the tactical channel so that rescue communications are uninterrupted. Other units stay off the air unless they hold information essential to locating or rescuing the member.

Question 16Fire Service Orientation, Safety, and Health

Which medical condition accounts for the largest share of on-duty firefighter deaths in the United States?

  1. Smoke inhalation injury
  2. Sudden cardiac events Correct answer.
  3. Traumatic burns
  4. Apparatus crash injuries

Explanation

Sudden cardiac events, often triggered by overexertion and heat stress during or shortly after fireground work, cause roughly half of on-duty firefighter deaths each year. Fitness programs, rehabilitation, and medical surveillance are aimed directly at this risk.

Question 17Fire Behavior

The fire tetrahedron adds which component to the traditional fire triangle?

  1. Chemical chain reaction Correct answer.
  2. The total fuel load available
  3. Thermal energy of the ignition source
  4. Oxygen concentration in the space

Explanation

The fire tetrahedron consists of fuel, oxygen, heat, and the chemical chain reaction that sustains flaming combustion. Removing any one of the four stops flaming combustion, which is why chain-breaking agents such as dry chemical and clean agents are effective.

Question 18Fire Behavior

In which stage of compartment fire development is the fire still limited to the area of origin, with the temperature only slightly above ambient and no substantial smoke layer?

  1. Decay
  2. Fully developed
  3. Growth
  4. Incipient Correct answer.

Explanation

The incipient stage begins at ignition and is characterized by a fire confined to the area of origin, low heat release, and a plume that has not yet built a thick smoke layer. Once the smoke layer forms and heat release climbs rapidly, the fire has entered the growth stage.

Question 19Fire Behavior

Heat traveling along a steel beam from a fire room into an adjacent room is an example of which mode of heat transfer?

  1. Convection
  2. Radiation
  3. Reflection
  4. Conduction Correct answer.

Explanation

Conduction is the transfer of heat through direct contact within or between solid materials, such as a steel beam carrying heat to a remote location. Convection moves heat through circulating fluids and gases, while radiation travels by electromagnetic waves.

Question 20Fire Behavior

Class B fires involve which type of fuel?

  1. Energized electrical equipment
  2. Flammable and combustible liquids Correct answer.
  3. Combustible cooking oils and fats
  4. Ordinary combustibles such as wood and paper

Explanation

Class B covers flammable and combustible liquids, which are extinguished by smothering or by interrupting the chain reaction rather than by cooling with water. Class A covers ordinary combustibles, Class C covers energized electrical equipment, and Class K covers cooking oils and fats.

Question 21Fire Behavior

A closed room shows heavy, dark smoke puffing from seams and cracks, stained windows, and almost no visible flame. This condition is most consistent with which situation?

  1. A freely burning, fuel-limited fire
  2. An imminent backdraft Correct answer.
  3. A flashover in progress
  4. A fire in the decay stage

Explanation

A backdraft occurs in a confined, oxygen-starved fire that has accumulated unburned fuel gases and products of incomplete combustion. Indicators include pressurized smoke forcing its way out of cracks, discolored windows, little visible flame, and air rushing inward when an opening is made.

Question 22Fire Behavior

Flashover is best described as which event?

  1. Sudden inflow of air into a compartment containing a smoldering, fuel-rich fire
  2. Near-simultaneous ignition of all exposed combustible surfaces in the compartment Correct answer.
  3. The point at which a fire has consumed all of the available fuel in the room
  4. Ignition of fire gases at the ceiling that stays localized near the ceiling

Explanation

Flashover is the transition from a growing fire to a fully developed fire in which radiant heat ignites essentially all exposed combustible surfaces in the compartment at nearly the same time. It is driven by heat feedback from the smoke layer to the contents.

Question 23Fire Behavior

The boundary between the hot upper layer of smoke and the cooler lower layer in a compartment is called the what?

  1. Neutral plane Correct answer.
  2. Flame front
  3. Rollover zone
  4. Thermal column

Explanation

The neutral plane is the interface between the hot, fuel-laden upper gas layer and the cooler, clearer lower layer. Its height shows how far the smoke layer has descended and where cooler air remains breathable and visible.

Question 24Fire Behavior

A flammable gas mixed with air at a concentration above its upper flammable limit will do what?

  1. Ignite with a delayed but more violent flash
  2. Produce a cooler but sustained flame
  3. Burn more rapidly because a higher fuel concentration exists
  4. Not burn until it is diluted into its flammable range Correct answer.

Explanation

Combustion can occur only within the flammable range between the lower and upper flammable limits. Above the upper limit the mixture is too fuel rich and oxygen deficient to support combustion until fresh air dilutes it back into the range.

Question 25Fire Behavior

The route that fire gases follow from an inlet opening, through the fire area, and out an exhaust opening is called the what?

  1. Pressure gradient
  2. Flow path Correct answer.
  3. Smoke horizon
  4. Ventilation profile

Explanation

A flow path is the movement of fire gases from where air enters to where smoke and heat exit. Controlling flow paths, such as by closing doors behind advancing crews, limits fire growth and improves conditions inside the structure.

Question 26Fire Behavior

In a ventilation-limited compartment fire, the heat release rate is most directly controlled by which factor?

  1. The rate at which air can enter the compartment Correct answer.
  2. The total mass of fuel available in the compartment
  3. The thermal conductivity of the compartment linings
  4. The autoignition temperature of the fuels involved

Explanation

Once a compartment fire becomes ventilation limited, oxygen supply rather than fuel quantity governs how much can burn. This is why an unplanned opening can sharply increase heat release and why coordinated ventilation is critical.

Question 27Fire Behavior

Which situation presents the greatest likelihood of spontaneous heating leading to ignition?

  1. Gasoline stored in a sealed metal container in a shaded area
  2. Green wood stacked in a cold, windy yard
  3. Oily rags piled in a warm, poorly ventilated corner Correct answer.
  4. Propane cylinders kept in a vented outdoor cage

Explanation

Spontaneous heating occurs when a material slowly oxidizes and the heat generated cannot escape, raising the material to its ignition temperature. Oil-soaked rags in a warm, poorly ventilated pile are a classic example because the oil is spread over a large absorbent surface and heat is trapped.

Question 28Fire Behavior

Which product of combustion is a colorless, odorless gas that preferentially binds to hemoglobin and reduces the blood's ability to carry oxygen?

  1. Phosgene
  2. Carbon dioxide
  3. Carbon monoxide Correct answer.
  4. Hydrogen cyanide

Explanation

Carbon monoxide is produced by incomplete combustion and binds to hemoglobin far more readily than oxygen does, starving tissues of oxygen. It is colorless and odorless, so it cannot be detected without monitoring equipment.

Question 29Building Construction and Fire Protection Systems

Which building construction type requires structural members to be of noncombustible material and provides the highest level of fire resistance?

  1. Type II
  2. Type V
  3. Type IV
  4. Type I Correct answer.

Explanation

Type I construction uses noncombustible structural members, usually steel or reinforced concrete, protected to achieve the highest fire-resistance ratings. The other types either permit combustible materials or require less protection of the structure.

Question 30Building Construction and Fire Protection Systems

Which construction type has exterior load-bearing walls of masonry with interior structural members made of wood?

  1. Type V
  2. Type III Correct answer.
  3. Type IV
  4. Type I

Explanation

Type III, or ordinary construction, combines noncombustible exterior walls with combustible interior framing concealed behind them. The hidden void spaces and wood members are what make this type hazardous to firefighters.

Question 31Building Construction and Fire Protection Systems

What is the purpose of a fire department connection on a building?

  1. To supply hose lines directly to firefighters operating on the fire floor
  2. To measure the flow rate of individual sprinkler heads
  3. To let a pumper supplement the standpipe or sprinkler system Correct answer.
  4. To drain water from the piping after a fire is extinguished

Explanation

A fire department connection allows an engine to pump water into the building's standpipe or sprinkler piping to supplement the built-in water supply. It feeds the building system rather than supplying hose lines directly.

Question 32Building Construction and Fire Protection Systems

A fire wall that divides a building into separate fire areas is required to do which of the following?

  1. Be supported by the combustible framing on at least one side
  2. Remain standing if the structure on either side collapses Correct answer.
  3. Have a fire-resistance rating no greater than the adjacent floor assembly
  4. Be permitted unprotected openings when the doors are self-closing

Explanation

A true fire wall must be structurally independent, or designed so that collapse of the construction on either side will not pull it down. This keeps the separation intact so fire cannot pass into the protected area.

Question 33Building Construction and Fire Protection Systems

How is structural steel in a Type I building typically protected from fire?

  1. Filling hollow sections with dry sand
  2. Wrapping the member in vinyl sheeting
  3. A single decorative coat of latex paint
  4. Sprayed fire-resistive material Correct answer.

Explanation

Sprayed fire-resistive material, gypsum encasement, or concrete cover insulates steel so it stays below the temperature at which it loses strength. Untreated steel heats quickly and can fail in minutes during a fire.

Question 34Building Construction and Fire Protection Systems

In a dry pipe sprinkler system, what occurs when a sprinkler head operates?

  1. Air escapes, the valve opens, and water flows after a delay Correct answer.
  2. Water discharges immediately because the piping is kept full
  3. A deluge valve opens every head on the system at once
  4. The system must be charged manually by the fire department

Explanation

Dry pipe systems hold pressurized air, so an opened head first releases air, letting the dry pipe valve trip and admit water. The resulting delay allows the fire to grow before water reaches the head.

Question 35Building Construction and Fire Protection Systems

A nightclub with an occupant load of 250 would be classified in which occupancy group?

  1. Mercantile
  2. Assembly Correct answer.
  3. Storage
  4. Business

Explanation

Places where groups of people gather for entertainment, dining, worship, or similar purposes are classified as assembly occupancies. The large occupant load and unfamiliar occupants drive stricter exiting requirements.

Question 36Building Construction and Fire Protection Systems

For firefighting purposes, a high-rise building is generally defined as one whose occupied floor is more than what height above the lowest level of fire department vehicle access?

  1. 35 feet
  2. 50 feet
  3. 75 feet Correct answer.
  4. 60 feet

Explanation

The common threshold is 75 feet, roughly the reach of the highest aerial apparatus. Above that height, suppression must rely on interior standpipes, stairs, and built-in systems.

Question 37Building Construction and Fire Protection Systems

What does a waterflow switch do on a sprinkler system?

  1. It measures residual pressure at the fire department connection
  2. It shuts off the water supply after flow begins
  3. It maintains air pressure in the system piping
  4. It signals an alarm when water moves through the piping Correct answer.

Explanation

A waterflow switch detects movement of water in the system and transmits an alarm, which is how a sprinkler operation is announced. It is a detection device, not a pressure regulator or shutoff.

Question 38Building Construction and Fire Protection Systems

What is the purpose of stairwell pressurization in a high-rise building?

  1. To supply combustion air to the fire floor
  2. To cool the stair enclosure during a fire
  3. To exhaust smoke from the fire floor by way of the stairs
  4. To keep smoke out of the stairwell so occupants can evacuate Correct answer.

Explanation

Pressurization forces air into the stair enclosure so that air flows out through any leakage rather than smoke flowing in. Occupants therefore get a tenable path of escape and firefighters get a clean attack stair.

Question 39Building Construction and Fire Protection Systems

Early suppression fast response (ESFR) sprinklers are primarily designed to do which of the following?

  1. Suppress high-challenge storage fires without in-rack sprinklers Correct answer.
  2. Protect light-hazard offices using very little water
  3. Provide exposure protection for exterior walls
  4. Control a fire until manual hose lines arrive

Explanation

ESFR heads deliver large droplets at high momentum from the ceiling to suppress, rather than merely control, high-hazard storage fires. This permits storage arrangements that would otherwise require in-rack sprinklers.

Question 40Building Construction and Fire Protection Systems

A roof supported by bowstring trusses presents which hazard to firefighters?

  1. They may fail suddenly and without warning above ceilings Correct answer.
  2. They fail slowly, giving long warning before collapse
  3. They are limited to noncombustible construction and cannot burn
  4. The trusses are fully protected by sprinklers, so collapse is unlikely

Explanation

Bowstring trusses are built of wood or steel in tension, so failure of one member can drop the entire roof abruptly. They are frequently hidden above a ceiling, so firefighters cannot see the deterioration that precedes collapse.

Question 41Personal Protective Equipment and Self-Contained Breathing Apparatus

The primary function of a Personal Alert Safety System (PASS) device is to:

  1. monitor and continuously display the remaining air cylinder pressure
  2. sound an alarm if the firefighter is motionless or in distress Correct answer.
  3. regulate the flow of compressed air from the cylinder to the facepiece
  4. filter toxic gases and particulates from the surrounding ambient air

Explanation

A PASS device is an electronic motion sensor worn on the turnout gear that sounds a loud audible and visual alarm when the wearer has been motionless for a preset interval, usually about 20 to 30 seconds, or when manually activated. It gives rescue teams a way to locate a downed or trapped firefighter. It is not part of the breathing circuit.

Question 42Personal Protective Equipment and Self-Contained Breathing Apparatus

Which NFPA standard sets the minimum design and performance requirements for structural fire fighting protective clothing?

  1. NFPA 1981
  2. NFPA 1851
  3. NFPA 1971 Correct answer.
  4. NFPA 1977

Explanation

NFPA 1971 covers the complete structural fire fighting protective ensemble, including coats, trousers, helmets, gloves, hoods, and footwear. It states what the garments must withstand and how they must perform when new.

Question 43Personal Protective Equipment and Self-Contained Breathing Apparatus

An SCBA low-air warning alarm is designed to activate when the remaining air supply reaches roughly:

  1. 10 percent of cylinder capacity
  2. 33 percent of cylinder capacity Correct answer.
  3. 50 percent of cylinder capacity
  4. 20 percent of cylinder capacity

Explanation

The low-air alarm is set to sound at approximately one-third of the cylinder's rated capacity. That remaining air is the firefighter's reserve for leaving the hazardous area. The alarm becomes more urgent as pressure continues to drop.

Question 44Personal Protective Equipment and Self-Contained Breathing Apparatus

The ear covers attached to a structural fire fighting helmet primarily shield the firefighter from:

  1. steady noise above 85 decibels
  2. heat, embers, and debris around the ears Correct answer.
  3. electrical shock from energized conductors
  4. side impact from falling objects

Explanation

Helmet ear covers are part of the protective ensemble and are built to keep heat, sparks, embers, and debris away from the ears and neck. They supplement, but do not replace, the protective hood.

Question 45Personal Protective Equipment and Self-Contained Breathing Apparatus

A firefighter who needs corrective lenses and must wear an SCBA facepiece should:

  1. tape the glasses to the outside of the facepiece lens
  2. loosen the head harness so the temple pieces pass outside the seal
  3. remove the facepiece briefly to clear fogged lenses
  4. use a spectacle kit mounted inside the facepiece Correct answer.

Explanation

Any break in the facepiece seal lets contaminated air in, so corrective lenses must be mounted inside the mask with an approved spectacle kit. Standard eyeglasses cannot be worn because the temples pass under the sealing surface.

Question 46Personal Protective Equipment and Self-Contained Breathing Apparatus

Which NFPA standard applies specifically to open-circuit self-contained breathing apparatus for the fire service?

  1. NFPA 1582
  2. NFPA 1971
  3. NFPA 1851
  4. NFPA 1981 Correct answer.

Explanation

NFPA 1981 establishes the minimum performance, testing, and certification requirements for open-circuit SCBA and combination SCBA/supplied-air respirators used by emergency services.

Question 47Personal Protective Equipment and Self-Contained Breathing Apparatus

A cylinder rated for 30 minutes is based on an assumed breathing rate of 40 liters per minute. If a firefighter's actual consumption is 80 liters per minute, the expected working duration is about:

  1. 45 minutes
  2. 30 minutes
  3. 60 minutes
  4. 15 minutes Correct answer.

Explanation

Rated duration assumes a fixed breathing rate; doubling the breathing rate halves the time the same amount of air will last. At 80 liters per minute the firefighter uses air twice as fast as the rating assumes. Working duration is always shorter than rated duration for an active firefighter.

Question 48Personal Protective Equipment and Self-Contained Breathing Apparatus

While working on the interior of a structure fire, a firefighter's low-air alarm begins to sound. The firefighter should:

  1. remove the facepiece and share air with the nearest crew member
  2. open the bypass valve and continue working
  3. continue the primary search until the alarm becomes continuous
  4. notify the crew and command, then exit the structure without delay Correct answer.

Explanation

The low-air alarm marks the point at which the remaining air is a reserve set aside for egress. The firefighter must announce the condition to the crew and command and begin an immediate, controlled exit.

Question 49Personal Protective Equipment and Self-Contained Breathing Apparatus

Before entering a hazardous atmosphere, a firefighter performs a negative pressure check by:

  1. closing the cylinder valve and breathing normally for 30 seconds
  2. sealing the opening and inhaling; the facepiece should collapse and hold Correct answer.
  3. opening the bypass valve and listening for a steady flow of air
  4. exhaling gently into the facepiece and watching for outward leakage

Explanation

In a negative pressure check the wearer blocks the facepiece opening and inhales gently, creating a slight vacuum. A properly sealed facepiece will pull in slightly against the face and hold that position without leaking.

Question 50Personal Protective Equipment and Self-Contained Breathing Apparatus

Under NFPA 1851, SCBA facepieces and regulators should be cleaned and disinfected:

  1. after each use Correct answer.
  2. annually
  3. weekly
  4. monthly

Explanation

NFPA 1851 requires routine cleaning and disinfecting of the facepiece and regulator after each use, since the mask contacts the wearer's skin and respiratory tract. Cleaning after each use also keeps equipment ready for the next call.