CDPH Lead Inspector/Assessor California State Practice Exam

How is the number of negative air machines determined for a project?

1. By the number of workers present

2. By estimating project duration

3. By square footage and required air exchanges per hour

4. By local regulations

The correct answer is: By square footage and required air exchanges per hour

The determination of the number of negative air machines for a project centers on square footage and the required air exchanges per hour. This method ensures that the ventilation needs of the work area are met to maintain a safe environment, especially in situations where hazardous materials, such as lead, are present. Calculating based on square footage allows for an accurate assessment of the volume of air that needs to be moved to sufficiently reduce airborne contaminants. Air exchange rates are essential in assessing how frequently the air within a space needs to be completely exchanged to ensure adequate ventilation and minimize potential health risks to workers. While other factors such as the number of workers, project duration, and compliance with local regulations may play roles in overall project planning and safety considerations, the primary method for determining the number of negative air machines fundamentally relies on the size of the work area and the specific air exchange requirements set forth in relevant safety standards and guidelines. This approach is crucial in ensuring that airborne pollutants are effectively controlled within the required limits.