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FDNY S17 Commercial Cooking Wet Chemical Fire
Extinguishing Systems Exam Questions and Correct
Answers with EXPLANATIONS LATEST THIS YEAR
Summarized Exam Coverage – FDNY S17 Commercial Cooking Wet Chemical Fire Extinguishing
Systems
The FDNY S17 Certificate of Fitness is required for individuals who inspect, test, maintain, or service wet
chemical fire extinguishing systems for commercial cooking operations (hoods, ducts, plenums, cooking
appliances) . Key topics include:
• Regulatory Framework: NYC Fire Code (FC) Chapter 9, NFPA 17A (Wet Chemical Extinguishing
Systems), NYC Mechanical Code (2014), and FDNY Operational Reference MEA 3-84 .
• System Components: Automatic actuators, manual pull stations, nozzle placement and
coverage, piping, agent storage tanks (wet chemical), fusible links, detection tubing, gas shut-off
valves (fuel shut-offs) .
• Inspection, Testing & Servicing Intervals:
o 6 Months: Semi-annual inspections by certified S17 technician (check components,
operation, linkage, condition) .
o 12 Years: Full hydrostatic testing of agent storage cylinders .
o 12 Months: Replacement of fusible links or replacement of detection tubing (per NFPA
17A) .
o 30 Days: Individual who performs work must notify FDNY Fire Prevention Division (BFP) .
o After Discharge (system activation or accidental discharge): Recharge by S17 certified
technician within 72 hours; must file a "Post-Discharge Report" (System Activation
Report) with FDNY .
o 3 Years: Inspection by FDNY Fire Prevention Division (BFP) .
• Approved Agents: Wet chemical agent must be sodium or potassium carbonate based (alkaline
salt solution); specific brand approved for the system (e.g., Ansul, Amerex, Kidde, Buckeye,
Pyro-Chem) .
• Nozzle Coverage: Must provide coverage of all cooking appliances (fryers, ranges, woks,
charbroilers, griddles) ; appliances may not exceed manufacturer’s maximum dimensions;
nozzles must be correctly positioned and unobstructed .
• Fuel Shut-Off: System must automatically shut off the fuel supply to all protected cooking
appliances (gas and/or electric) when activated .
• Kitchen Equipment: Type I hood required for grease-laden vapors ; Ansul fire suppression
system connection to appliance interlock .
• Safety Procedures: Lockout/tagout for gas valves ; discharging system safely; proper handling
and disposal of wet chemical; notifying FDNY after system activation .
• Servicing & Testing: Visual inspection of nozzles for corrosion or blockage; testing of manual pull
stations; verifying detection line integrity; checking pressure gauges; verifying fuel shut-off
operation .
1. An S17 technician is performing a semi-annual inspection of a wet chemical system. The technician
notices that one nozzle is missing the protective cap that was originally installed. What is the
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appropriate action?
A) Leave the nozzle as is; the cap is only for shipping
B) Order and install a replacement manufacturer-approved cap to prevent grease or debris from
entering the nozzle
C) Remove the nozzle entirely and plug the fitting
D) Ignore it because the cap is not required for operation
Answer: B — Nozzle caps protect the orifice from grease, dust, and debris that could clog the nozzle and
prevent proper discharge.
2. After a wet chemical system discharges due to a kitchen fire, the S17 technician is called to recharge
the system. Under FDNY rules, what is the maximum time allowed to restore the system to operational
status after discharge?
A) 24 hours
B) 48 hours
C) 72 hours
D) 7 days
Answer: C — The system must be recharged and returned to service within 72 hours of activation or
discharge .
3. An S17 technician inspects a wet chemical system and finds that the agent storage cylinder pressure
gauge reads zero. The system has not been discharged. What is the most likely cause and what must the
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technician do?
A) The gauge is faulty; replace the gauge and note in the report
B) The cylinder has lost pressure due to a leak or a stuck gauge; the technician must perform a full
system check, hydrostatically test the cylinder (if required), and recharge or replace the cylinder after
verifying integrity
C) Zero pressure is normal for a charged system; no action needed
D) The cylinder was never charged; ignore it and note in the log
Answer: B — Loss of pressure indicates loss of expellant gas (nitrogen) or wet chemical agent; the
cylinder must be inspected and recharged, or replaced.
4. A wet chemical system is installed over a 6-foot wide gas charbroiler. The S17 technician is inspecting
the nozzle placement. According to NFPA 17A and typical manufacturer listings, what is the maximum
width of cooking appliance that a single nozzle can cover unless specifically listed for a wider coverage?
A) 2 feet
B) 3 feet
C) 4 feet
D) 5 feet
Answer: C — Most wet chemical nozzles are listed to cover a maximum 4-foot width of appliance; wider
appliances require additional nozzles.
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5. Upon activation of a wet chemical system, which of the following must occur immediately as part of
the system’s designed sequence?
A) The exhaust fan must increase speed
B) The fuel supply (gas or electric power) to all protected cooking appliances must be automatically shut
off
C) The sprinkler system in the dining room must activate
D) The Ansul system must discharge for 30 seconds
Answer: B — When the system activates, it must simultaneously cut the fuel supply (gas valves or electric
disconnect) to the protected appliances.
6. An S17 technician is inspecting a wet chemical system that was installed 5 years ago. The fusible links
on the detection line have never been replaced. According to NFPA 17A, what is the required
replacement interval for fusible links in a wet chemical system?
A) Every 6 months
B) Every 12 months
C) Every 24 months
D) No replacement required unless damaged
Answer: B — NFPA 17A requires that fusible links be replaced at least annually (every 12 months).
7. The S17 certificate of fitness is required for any individual who performs inspection, testing,
maintenance, or servicing of commercial cooking wet chemical systems. Which of the following actions
FDNY S17 Commercial Cooking Wet Chemical Fire
Extinguishing Systems Exam Questions and Correct
Answers with EXPLANATIONS LATEST THIS YEAR
Summarized Exam Coverage – FDNY S17 Commercial Cooking Wet Chemical Fire Extinguishing
Systems
The FDNY S17 Certificate of Fitness is required for individuals who inspect, test, maintain, or service wet
chemical fire extinguishing systems for commercial cooking operations (hoods, ducts, plenums, cooking
appliances) . Key topics include:
• Regulatory Framework: NYC Fire Code (FC) Chapter 9, NFPA 17A (Wet Chemical Extinguishing
Systems), NYC Mechanical Code (2014), and FDNY Operational Reference MEA 3-84 .
• System Components: Automatic actuators, manual pull stations, nozzle placement and
coverage, piping, agent storage tanks (wet chemical), fusible links, detection tubing, gas shut-off
valves (fuel shut-offs) .
• Inspection, Testing & Servicing Intervals:
o 6 Months: Semi-annual inspections by certified S17 technician (check components,
operation, linkage, condition) .
o 12 Years: Full hydrostatic testing of agent storage cylinders .
o 12 Months: Replacement of fusible links or replacement of detection tubing (per NFPA
17A) .
o 30 Days: Individual who performs work must notify FDNY Fire Prevention Division (BFP) .
o After Discharge (system activation or accidental discharge): Recharge by S17 certified
technician within 72 hours; must file a "Post-Discharge Report" (System Activation
Report) with FDNY .
o 3 Years: Inspection by FDNY Fire Prevention Division (BFP) .
• Approved Agents: Wet chemical agent must be sodium or potassium carbonate based (alkaline
salt solution); specific brand approved for the system (e.g., Ansul, Amerex, Kidde, Buckeye,
Pyro-Chem) .
• Nozzle Coverage: Must provide coverage of all cooking appliances (fryers, ranges, woks,
charbroilers, griddles) ; appliances may not exceed manufacturer’s maximum dimensions;
nozzles must be correctly positioned and unobstructed .
• Fuel Shut-Off: System must automatically shut off the fuel supply to all protected cooking
appliances (gas and/or electric) when activated .
• Kitchen Equipment: Type I hood required for grease-laden vapors ; Ansul fire suppression
system connection to appliance interlock .
• Safety Procedures: Lockout/tagout for gas valves ; discharging system safely; proper handling
and disposal of wet chemical; notifying FDNY after system activation .
• Servicing & Testing: Visual inspection of nozzles for corrosion or blockage; testing of manual pull
stations; verifying detection line integrity; checking pressure gauges; verifying fuel shut-off
operation .
1. An S17 technician is performing a semi-annual inspection of a wet chemical system. The technician
notices that one nozzle is missing the protective cap that was originally installed. What is the
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appropriate action?
A) Leave the nozzle as is; the cap is only for shipping
B) Order and install a replacement manufacturer-approved cap to prevent grease or debris from
entering the nozzle
C) Remove the nozzle entirely and plug the fitting
D) Ignore it because the cap is not required for operation
Answer: B — Nozzle caps protect the orifice from grease, dust, and debris that could clog the nozzle and
prevent proper discharge.
2. After a wet chemical system discharges due to a kitchen fire, the S17 technician is called to recharge
the system. Under FDNY rules, what is the maximum time allowed to restore the system to operational
status after discharge?
A) 24 hours
B) 48 hours
C) 72 hours
D) 7 days
Answer: C — The system must be recharged and returned to service within 72 hours of activation or
discharge .
3. An S17 technician inspects a wet chemical system and finds that the agent storage cylinder pressure
gauge reads zero. The system has not been discharged. What is the most likely cause and what must the
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technician do?
A) The gauge is faulty; replace the gauge and note in the report
B) The cylinder has lost pressure due to a leak or a stuck gauge; the technician must perform a full
system check, hydrostatically test the cylinder (if required), and recharge or replace the cylinder after
verifying integrity
C) Zero pressure is normal for a charged system; no action needed
D) The cylinder was never charged; ignore it and note in the log
Answer: B — Loss of pressure indicates loss of expellant gas (nitrogen) or wet chemical agent; the
cylinder must be inspected and recharged, or replaced.
4. A wet chemical system is installed over a 6-foot wide gas charbroiler. The S17 technician is inspecting
the nozzle placement. According to NFPA 17A and typical manufacturer listings, what is the maximum
width of cooking appliance that a single nozzle can cover unless specifically listed for a wider coverage?
A) 2 feet
B) 3 feet
C) 4 feet
D) 5 feet
Answer: C — Most wet chemical nozzles are listed to cover a maximum 4-foot width of appliance; wider
appliances require additional nozzles.
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5. Upon activation of a wet chemical system, which of the following must occur immediately as part of
the system’s designed sequence?
A) The exhaust fan must increase speed
B) The fuel supply (gas or electric power) to all protected cooking appliances must be automatically shut
off
C) The sprinkler system in the dining room must activate
D) The Ansul system must discharge for 30 seconds
Answer: B — When the system activates, it must simultaneously cut the fuel supply (gas valves or electric
disconnect) to the protected appliances.
6. An S17 technician is inspecting a wet chemical system that was installed 5 years ago. The fusible links
on the detection line have never been replaced. According to NFPA 17A, what is the required
replacement interval for fusible links in a wet chemical system?
A) Every 6 months
B) Every 12 months
C) Every 24 months
D) No replacement required unless damaged
Answer: B — NFPA 17A requires that fusible links be replaced at least annually (every 12 months).
7. The S17 certificate of fitness is required for any individual who performs inspection, testing,
maintenance, or servicing of commercial cooking wet chemical systems. Which of the following actions
