Kitchen Hood Fire Suppression
Technician Certification Questions &
Correct Answers (Verified Answers) Plus
Rationales Instant Download Pdf
1. A wet chemical kitchen hood fire suppression system is primarily designed to
extinguish fires involving:
A) Class A only
B) Class B only
C) Class K
D) Class C
Answer: C
Rationale: Class K fires involve cooking oils and fats common in commercial kitchens.
Wet chemical agents saponify the oils, creating a foam layer that cools and seals off
oxygen. NFPA 17A specifically addresses Class K protection.
2. What is the primary mechanism by which wet chemical agents extinguish a grease
fire?
A) Oxygen dilution
B) Saponification
C) Dry chemical interruption of flame chemistry
D) Cooling below autoignition
Answer: B
Rationale: Saponification converts fatty acids into a soapy foam that traps vapors and
,cools the fuel surface. This is unique to wet chemicals and highly effective for kitchen
grease.
3. According to NFPA 96, hood exhaust systems must be inspected:
A) Monthly
B) Quarterly
C) Semi-annually
D) Annually
Answer: B
Rationale: NFPA 96 requires quarterly inspections for commercial cooking exhaust
systems unless higher volume cooking mandates more frequent checks.
4. The fusible link in a kitchen hood suppression system activates at a temperature
typically between:
A) 100–150°F (38–66°C)
B) 212–250°F (100–121°C)
C) 360–500°F (182–260°C)
D) 600–700°F (316–371°C)
Answer: C
Rationale: Fusible links are rated for fire conditions, not normal cooking heat. Common
ratings are 360°F, 450°F, or 500°F to prevent nuisance trips.
5. How often must a wet chemical system be recharged after a discharge?
A) Immediately by a certified technician
B) Within 30 days
C) Within 7 days
D) At the next scheduled inspection
Answer: A
Rationale: NFPA 17A requires immediate recharge after any discharge, even accidental,
to ensure continuous protection.
,6. The agent storage container pressure for a typical wet chemical system is monitored
by:
A) A sight glass
B) A pressure gauge
C) A low-pressure switch
D) A nitrogen pre-charge
Answer: B
Rationale: A pressure gauge (usually 175–200 psi) shows if nitrogen propellant is intact.
No gauge indicates loss of pressure.
7. When replacing a fusible link, you must:
A) Use any link with the same physical size
B) Use only the manufacturer-specified temperature rating and size
C) Use a higher temperature rating to avoid nuisance trips
D) Remove the link and bypass the system
Answer: B
Rationale: Incorrect temperature or size prevents proper activation. Manufacturer
specifications must be followed for certification.
8. A manual pull station for a hood system must be located:
A) Inside the kitchen hood
B) At the cook line within reach
C) At an exit path, clearly marked, 42–48 inches high
D) Near the electrical panel
Answer: C
Rationale: NFPA 17A requires manual stations be along escape routes, 42–48 inches AFF,
with clear signage.
9. After system discharge, what must be done with the gas and electric shutoffs?
A) Reset automatically
, B) Remain off until manually reset after inspection
C) Turn back on immediately to resume cooking
D) Be replaced
Answer: B
Rationale: Shutoffs remain locked out until system is recharged and inspected, ensuring
no re-ignition hazard.
10. The maximum time allowed for the gas valve to close after system activation is:
A) Immediate (0 seconds)
B) 1 second
C) 3 seconds
D) 10 seconds
Answer: A
Rationale: NFPA 17A requires instantaneous closure of fuel supplies when the
suppression system activates.
11. What type of nozzle is used to apply wet chemical agent onto vertical cooking
surfaces (e.g., fryer backsplashes)?
A) Omnidirectional nozzle
B) Splatter nozzle (directional)
C) Conical spray nozzle
D) Foam nozzle
Answer: B
Rationale: Directional splatter nozzles are aimed at specific grease-laden surfaces;
omnidirectional are for open areas.
12. When inspecting a wet chemical system, the agent cylinder weight must be within:
A) ±2% of full label weight
B) ±5% of full label weight
Technician Certification Questions &
Correct Answers (Verified Answers) Plus
Rationales Instant Download Pdf
1. A wet chemical kitchen hood fire suppression system is primarily designed to
extinguish fires involving:
A) Class A only
B) Class B only
C) Class K
D) Class C
Answer: C
Rationale: Class K fires involve cooking oils and fats common in commercial kitchens.
Wet chemical agents saponify the oils, creating a foam layer that cools and seals off
oxygen. NFPA 17A specifically addresses Class K protection.
2. What is the primary mechanism by which wet chemical agents extinguish a grease
fire?
A) Oxygen dilution
B) Saponification
C) Dry chemical interruption of flame chemistry
D) Cooling below autoignition
Answer: B
Rationale: Saponification converts fatty acids into a soapy foam that traps vapors and
,cools the fuel surface. This is unique to wet chemicals and highly effective for kitchen
grease.
3. According to NFPA 96, hood exhaust systems must be inspected:
A) Monthly
B) Quarterly
C) Semi-annually
D) Annually
Answer: B
Rationale: NFPA 96 requires quarterly inspections for commercial cooking exhaust
systems unless higher volume cooking mandates more frequent checks.
4. The fusible link in a kitchen hood suppression system activates at a temperature
typically between:
A) 100–150°F (38–66°C)
B) 212–250°F (100–121°C)
C) 360–500°F (182–260°C)
D) 600–700°F (316–371°C)
Answer: C
Rationale: Fusible links are rated for fire conditions, not normal cooking heat. Common
ratings are 360°F, 450°F, or 500°F to prevent nuisance trips.
5. How often must a wet chemical system be recharged after a discharge?
A) Immediately by a certified technician
B) Within 30 days
C) Within 7 days
D) At the next scheduled inspection
Answer: A
Rationale: NFPA 17A requires immediate recharge after any discharge, even accidental,
to ensure continuous protection.
,6. The agent storage container pressure for a typical wet chemical system is monitored
by:
A) A sight glass
B) A pressure gauge
C) A low-pressure switch
D) A nitrogen pre-charge
Answer: B
Rationale: A pressure gauge (usually 175–200 psi) shows if nitrogen propellant is intact.
No gauge indicates loss of pressure.
7. When replacing a fusible link, you must:
A) Use any link with the same physical size
B) Use only the manufacturer-specified temperature rating and size
C) Use a higher temperature rating to avoid nuisance trips
D) Remove the link and bypass the system
Answer: B
Rationale: Incorrect temperature or size prevents proper activation. Manufacturer
specifications must be followed for certification.
8. A manual pull station for a hood system must be located:
A) Inside the kitchen hood
B) At the cook line within reach
C) At an exit path, clearly marked, 42–48 inches high
D) Near the electrical panel
Answer: C
Rationale: NFPA 17A requires manual stations be along escape routes, 42–48 inches AFF,
with clear signage.
9. After system discharge, what must be done with the gas and electric shutoffs?
A) Reset automatically
, B) Remain off until manually reset after inspection
C) Turn back on immediately to resume cooking
D) Be replaced
Answer: B
Rationale: Shutoffs remain locked out until system is recharged and inspected, ensuring
no re-ignition hazard.
10. The maximum time allowed for the gas valve to close after system activation is:
A) Immediate (0 seconds)
B) 1 second
C) 3 seconds
D) 10 seconds
Answer: A
Rationale: NFPA 17A requires instantaneous closure of fuel supplies when the
suppression system activates.
11. What type of nozzle is used to apply wet chemical agent onto vertical cooking
surfaces (e.g., fryer backsplashes)?
A) Omnidirectional nozzle
B) Splatter nozzle (directional)
C) Conical spray nozzle
D) Foam nozzle
Answer: B
Rationale: Directional splatter nozzles are aimed at specific grease-laden surfaces;
omnidirectional are for open areas.
12. When inspecting a wet chemical system, the agent cylinder weight must be within:
A) ±2% of full label weight
B) ±5% of full label weight
