NASCLA Accredited Commercial General ContractorSpecialties and EquipmentMedium
A contractor is evaluating different types of fire suppression systems for a new commercial kitchen. The client requires a system that can effectively extinguish grease fires without causing significant damage to sensitive kitchen equipment. Which type of fire suppression system is most suitable for this application?
- AWater sprinkler system
- BWet chemical system
- CCO2 suppression system
- DDry chemical system
Show answer & explanationAnswer & explanation
Correct answer: B. Wet chemical system
Wet chemical systems are specifically designed for Class K (kitchen/grease) fires. They create a saponification effect, turning hot grease into a non-combustible soap-like substance, effectively suppressing the fire and preventing re-ignition, while being less damaging to equipment than dry chemicals.
Why the other options are wrong
- A. Water can spread grease fires and damage electrical equipment.
- C. CO2 systems displace oxygen, which works for some fires, but is less effective on deep-seated grease fires and poses an asphyxiation risk in occupied spaces.
- D. Dry chemical systems are effective but leave a corrosive residue that is difficult to clean and can damage sensitive equipment.
Wet Chemical Fire Suppression
A fire suppression system primarily used in commercial kitchens to combat Class K (grease) fires. It applies a liquid agent that reacts with hot oils and fats to create a non-combustible foam layer.
- Effective for Class K fires (cooking oils/fats).
- Works by saponification and cooling.
- Less corrosive and easier to clean up than dry chemical agents, reducing equipment damage.
Memory trick: Kitchen fires need a 'Wet' solution, not just 'Dry' or 'Watery' wishes.