An Ansul System is an automatic fire suppression system specifically designed for commercial kitchen hood and ductwork applications, using pressurized wet chemical agents to extinguish grease fires. Ansul is a widely recognized brand in the fire suppression industry, and the term is commonly used generically for similar wet chemical suppression systems. These systems are the standard fire suppression method required in commercial kitchen exhaust systems under NFPA 96 standards.
Technical Details
Ansul kitchen systems use potassium carbonate-based wet chemical agents (typically sodium bicarbonate or potassium bicarbonate) that cool burning grease and create a barrier preventing re-ignition. Agents are stored in pressurized cylinders and discharged through nozzles covering the cooking area when heat sensors detect temperatures above 350 degrees Fahrenheit or when manual pull stations are activated. Typical systems protect hood areas of 10 to 50 linear feet with discharge times of 10 to 20 seconds.
Applications
Ansul systems are installed in all commercial kitchens with Type I hoods above high-heat cooking equipment. Systems protect hoods, cooking equipment surfaces, and connected ductwork from Class B grease fires.
Practical Significance
Ansul systems provide rapid fire suppression, prevent property damage, and protect personnel safety in commercial kitchens. Annual inspections and maintenance are required by fire codes, with agent replacement necessary after each discharge event.