Fires that involve ordinary materials such as paper, cardboard, and wood are classified as Type _____ fires.

• A. Type B Fires
• B. Type A Fires
• C. Type C Fires
• D. Electrical Fires

Answer: (B)

Fires involving ordinary combustibles such as paper, cardboard, and wood are Type A fires. This category covers common materials that burn and leave ash, and they are best cooled with water-based extinguishing agents. Water absorbs heat effectively, cooling the fuel below its ignition temperature, which is why extinguishers for ordinary combustibles are the appropriate choice. Fires involving flammable liquids or energized electrical equipment require different extinguishing methods and should not be treated as Type A, since water can spread the fire or cause safety hazards in those cases. In HVAC settings, recognizing Type A helps you select the right extinguisher and approach when a small fire from packaging, wood debris, or paper products occurs.