Demand control ventilation activation thresholds specify space size and occupancy density. Which option reflects the standard threshold?

Demand control ventilation activation thresholds specify space size and occupancy density. Which option reflects the standard threshold?

• A. >400 ft² with ≥20 people per 1000 ft².
• B. >600 ft² with ≥40 people per 1000 ft².
• C. >350 ft² with ≥25 people per 1000 ft².
• D. >500 ft² with ≥25 people per 1000 ft².

Answer: (D)

Demand control ventilation is allowed to be activated only in spaces that meet both a minimum size and a minimum occupancy density. The standard threshold requires a space larger than 500 ft² and an occupancy density of at least 25 people per 1000 ft². The option with more than 500 ft² and at least 25 people per 1000 ft² satisfies both criteria, making it the correct choice. The other options fall short because they either specify a space smaller than 500 ft² or an occupancy density below 25 per 1000 ft², so they don’t meet the standard threshold.

Demand control ventilation is allowed to be activated only in spaces that meet both a minimum size and a minimum occupancy density. The standard threshold requires a space larger than 500 ft² and an occupancy density of at least 25 people per 1000 ft². The option with more than 500 ft² and at least 25 people per 1000 ft² satisfies both criteria, making it the correct choice. The other options fall short because they either specify a space smaller than 500 ft² or an occupancy density below 25 per 1000 ft², so they don’t meet the standard threshold.