For Class A fires, which extinguishers are generally suitable?

• A. Water-based extinguishers
• B. CO2 extinguishers
• C. Wet chemical extinguishers
• D. Water-based extinguishers and dry chemical ABC extinguishers

Answer: (D)

Fires involving ordinary combustibles burn fuels like wood, paper, and textiles, so the extinguishing methods you choose must cool the fuel and/or disrupt the chemical reactions happening in the flame. Water-based extinguishers are ideal here because they absorb a lot of heat, cooling the fuel so it no longer sustains combustion. Dry chemical ABC extinguishers are also effective for these fires because the powder chemically disrupts the flame and coats the fuel, helping prevent reignition and working on a wide range of common fire types.

Wet chemical extinguishers are designed for kitchens and fats/oils, where they react with the oil to form a soapy layer, not for typical Class A materials. CO2 extinguishers displace oxygen and are useful for electrical fires or small, enclosed spaces, but they don’t cool the fuel well and can allow a Class A fire to reignite, especially on porous materials.

So, for Class A fires, the best fit is using either water-based extinguishers or dry chemical ABC extinguishers, giving effective cooling and broad extinguishing capability.