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3 conditions for a fire to occur
fuel, oxygen, heat
Classes of fires
A, B, C, D, K
Class A fire
ordinary combustibles
Class B fire
flammable liquids
Class C fire
live electrical equipment
Class D fire
combustible metal
Class K fire
commercial cooking equipment
Fire zone classes
A, B, C, D, X
Class A zone
area of heavy airflow past regular arrangements of similarly shaped obstructions
Class B zone
area of heavy airflow past aerodynamically clean obstructions
Class C zone
area of relatively low airflow
Class D zone
area of very little or no airflow
Class X zone
area of heavy airflow and of unusual construction, making uniform distribution of the extinguishing agent very difficult
2 categories of engine fire detection systems
spot detection, continuous loop