What does a rating of 2A indicate for a Class A fire extinguisher?

A rating of 2A on a Class A fire extinguisher signifies the extinguisher's effectiveness in suppressing fires involving ordinary combustibles, based on a standardized test performed with water. Specifically, the "2" in the rating indicates that the extinguisher can effectively extinguish the equivalent of 2.5 gallons of water. This means it can handle fire situations that require the suppression capabilities similar to that amount of water, making it suitable for small to medium-sized fires involving materials like wood, paper, and textiles.

The other ratings and options do not correspond to the standardized measurement used in the classification of fire extinguishers. This standardized approach helps firefighters and users understand the performance and effectiveness of extinguishers, ensuring they can make informed choices in emergency situations.