What ventilation rate is associated with Category 5 Smoke?

What ventilation rate is associated with Category 5 Smoke?

• A. 50,000
• B. 60,000
• C. 69,000 or greater
• D. 75,000

Answer: (C)

Ventilation rate is a measure of how much air is moving through the burn, which directly influences how intensely the fire can burn and how much smoke it produces. Category 5 Smoke represents the highest end of smoke production, so it’s tied to the largest ventilation rates. The standard defines Category 5 as a ventilation rate of 69,000 or greater, which signals very heavy smoke output and potential upwind and downwind impacts. Values below that threshold correspond to lower smoke categories, not Category 5.

Ventilation rate is a measure of how much air is moving through the burn, which directly influences how intensely the fire can burn and how much smoke it produces. Category 5 Smoke represents the highest end of smoke production, so it’s tied to the largest ventilation rates. The standard defines Category 5 as a ventilation rate of 69,000 or greater, which signals very heavy smoke output and potential upwind and downwind impacts. Values below that threshold correspond to lower smoke categories, not Category 5.