A 4-A rating extinguisher provides protection for how many square feet?

A 4-A rating extinguisher provides protection for how many square feet?

• A. 4,000
• B. 12,000
• C. 8,000
• D. 9,000

Answer: (B)

Understanding extinguisher ratings helps you translate the label into real-world coverage. The A rating is for ordinary combustibles like wood and paper, and the number shows the extinguisher’s performance in the standard fire test, reflecting its water-equivalent capacity and how much area it can reasonably control. A four-A rating corresponds to a protection area of about 12,000 square feet. That means one extinguisher with this rating is considered capable, under the standard test, of handling a fire involving ordinary combustibles across roughly 12,000 square feet. When planning, you compare the total area to be protected with this coverage, keeping in mind real-world conditions can affect effectiveness. The other area figures don’t align with the standard rating for a 4-A device, so they’re not the correct match.

Understanding extinguisher ratings helps you translate the label into real-world coverage. The A rating is for ordinary combustibles like wood and paper, and the number shows the extinguisher’s performance in the standard fire test, reflecting its water-equivalent capacity and how much area it can reasonably control. A four-A rating corresponds to a protection area of about 12,000 square feet. That means one extinguisher with this rating is considered capable, under the standard test, of handling a fire involving ordinary combustibles across roughly 12,000 square feet. When planning, you compare the total area to be protected with this coverage, keeping in mind real-world conditions can affect effectiveness. The other area figures don’t align with the standard rating for a 4-A device, so they’re not the correct match.