Which option correctly identifies the feature that focuses on ventilation effectiveness?

• A. Feature 01 Air Quality Standards
• B. Feature 02 Indoor Lighting
• C. Feature 04 VOC Reduction
• D. Feature 03 Ventilation Effectiveness

Answer: (D)

Ventilation effectiveness is about how well the ventilation system actually delivers fresh air to the occupants and dilutes or removes contaminants in the occupied space. It goes beyond just meeting general air quality targets or reducing specific pollutants; even with good standards or low VOCs, air can circulate poorly and create stagnant zones or short-circuiting, which undermines real-world air cleanliness. This feature focuses on the performance of air distribution—ensuring the breathing zone receives adequate supply air and that contaminants are effectively removed, often assessed through tests that measure how air moves and contaminant concentrations in the space.