When Class A combustibles and Class B flammables are high, what is the hazard classification?

The classification of hazards associated with Class A combustibles, such as wood, paper, and textiles, combined with Class B flammables, which include liquids like gasoline and oils, is best identified as Extra Hazard. This classification indicates a significant risk due to the combination of materials that can produce intense fires and contribute to rapid fire spread.

In environments where there are elevated levels of both Class A and Class B materials, the fire risks are compounded. Class A combustibles require significant heat to ignite but, once ignited, can produce substantial amounts of combustible material. Class B flammables, on the other hand, can ignite easily and burn rapidly, often creating intense heat and flames that can spread fire quickly.

Extra Hazard is used in fire protection solutions and building codes to indicate that the risk is above normal, necessitating enhanced fire protection measures like sprinkler systems with higher densities, fire extinguishing systems, or specialized fire suppression equipment. This classification reflects an understanding of the combined effects of these materials, making it crucial for those involved in fire safety planning and management to recognize and address these elevated dangers appropriately.