An extinguishing device with an A rating provides protection for how many square feet per A rating?

An extinguishing device with an A rating provides protection for how many square feet per A rating?

• A. 1000
• B. 3000
• C. 6000
• D. 12000

Answer: (B)

The rating on an extinguishing device expresses how much area it is designed to protect against fires involving ordinary combustibles, measured in square feet. For each A rating, the device is considered capable of protecting about 3,000 square feet. So a device with a certain A rating provides roughly 3,000 ft² of coverage per rating unit, and you multiply by the number of A ratings for larger areas (for example, 2-A would cover about 6,000 ft²). This rating specifically applies to ordinary combustibles, not to other hazards like liquids or electrical equipment (which fall under B or C ratings).

The rating on an extinguishing device expresses how much area it is designed to protect against fires involving ordinary combustibles, measured in square feet. For each A rating, the device is considered capable of protecting about 3,000 square feet. So a device with a certain A rating provides roughly 3,000 ft² of coverage per rating unit, and you multiply by the number of A ratings for larger areas (for example, 2-A would cover about 6,000 ft²). This rating specifically applies to ordinary combustibles, not to other hazards like liquids or electrical equipment (which fall under B or C ratings).