In mechanical ventilation supply systems, the required rate of outdoor air flow must be directed to which area within each occupiable space?

In mechanical ventilation supply systems, it is essential to ensure that the required rate of outdoor air flow is directed to the breathing zone within each occupiable space. The breathing zone is defined as the space within a specific height range from the floor, typically about 3 to 6 feet above the floor, where occupants are most likely to inhale and exhale air. By directing outdoor air to this zone, the ventilation system can effectively provide fresh air to the areas where people spend the most time, thereby enhancing indoor air quality and reducing the concentration of airborne contaminants.

This focus on the breathing zone is crucial as it helps to maintain the health and comfort of building occupants by ensuring that they receive adequate ventilation directly where they breathe. Proper ventilation in this area can also help in controlling humidity levels and providing thermal comfort, further contributing to a safe and pleasant indoor environment.