Associate Safety Professional Practice Exam

Under what circumstances would a 5000 fpm exhaust duct velocity be justified in a ventilation system?

1. In cases of extreme toxicity

2. To enhance worker comfort

3. To reduce settling of particulates

4. To minimize noise levels

The correct answer is: To reduce settling of particulates

The choice stating that a 5000 fpm exhaust duct velocity is justified to reduce settling of particulates is relevant because high velocities in ventilation systems are often necessary to keep airborne contaminants suspended and prevent them from settling out of the airstream. When dealing with fine particulates, particularly in processes that generate dust or other particles, maintaining a higher air velocity helps ensure that these particles are effectively captured and removed from the workspace. This is crucial in environments where the deposition of particulates can lead to health hazards, diminished air quality, or product contamination. Higher velocities are particularly effective in controlling particulate matter because they help overcome the gravitational settling forces that would otherwise cause particles to drop out of the air if the velocity were lower. Thus, achieving and maintaining a 5000 fpm velocity aligns with the goal of minimizing the accumulation of harmful dust and other particulates in the air and on surfaces, contributing to a safer and more compliant work environment.