Certified Fire Protection Specialist (CFPS) — Question 30

How much depth of particle-sized dusts of organic materials such as wood or food products can, under the right set of conditions, result in a flash fire or explosion?

Answer options

• A. Less than 1/8 in. (3 mm)
• B. Between 1/8 and 1/4 in. (3 mm to 6.4 mm)
• C. Between 1/4 and 1/2 in. (6.4 mm to 12.7 mm)
• D. At least 1/2 in. (12.7 mm)

Correct answer: D

Explanation

The correct answer is D, as a depth of at least 1/2 inch (12.7 mm) of combustible dust can create enough fuel and surface area to support a flash fire or explosion. Options A, B, and C do not provide sufficient material density to reach the critical mass needed for such an event.