Category 3 Smoke corresponds to which ventilation rate range?

Category 3 Smoke corresponds to which ventilation rate range?

• A. 0–17,249
• B. 17,250–34,499
• C. 34,500–51,749
• D. 51,750–68,999

Answer: (C)

Ventilation rate is the metric used to categorize smoke intensity from a burn in a system that links plume behavior to manageable thresholds. The ranges are set so that different levels of air exchange and smoke impact fall into distinct categories. Category 3 sits in the mid-to-upper portion of these thresholds, meaning it represents a moderate to relatively strong plume with noticeable downwind impact but not the highest level of concern. The correct range for Category 3 is 34,500 to 51,749. This places a burn in the middle of the scale: lower ranges correspond to lighter smoke (Category 1 or 2), while the highest range corresponds to the most significant smoke impact (Category 4). If your ventilation rate calculation falls within 34,500–51,749, that aligns with Category 3’s defined band and the expected plume characteristics and management considerations that come with it.

Ventilation rate is the metric used to categorize smoke intensity from a burn in a system that links plume behavior to manageable thresholds. The ranges are set so that different levels of air exchange and smoke impact fall into distinct categories. Category 3 sits in the mid-to-upper portion of these thresholds, meaning it represents a moderate to relatively strong plume with noticeable downwind impact but not the highest level of concern.

The correct range for Category 3 is 34,500 to 51,749. This places a burn in the middle of the scale: lower ranges correspond to lighter smoke (Category 1 or 2), while the highest range corresponds to the most significant smoke impact (Category 4). If your ventilation rate calculation falls within 34,500–51,749, that aligns with Category 3’s defined band and the expected plume characteristics and management considerations that come with it.