Associate Safety Professional Practice Exam

What is a reason why a canopy hood would not be considered an acceptable ventilation system for a large solvent dip tank?

1. It does not cover the entire work area

2. The airflow is too weak

3. Contaminant is drawn through the breathing zone

4. It increases the temperature of the workspace

The correct answer is: Contaminant is drawn through the breathing zone

A canopy hood is designed to provide local exhaust ventilation by capturing contaminants released into the air within a certain area. However, when it comes to large solvent dip tanks, one of the main reasons a canopy hood may not be acceptable is that it can lead to contaminants being drawn through the breathing zone of the workers. This situation exposes workers to hazardous vapors or fumes, compromising their health and safety. In a proper ventilation system, it's essential to minimize the inhalation of harmful substances. If the canopy hood is positioned such that it allows vapors from the solvent dip tank to enter the breathing zone, it becomes ineffective at protecting workers from exposure, thereby defeating the primary purpose of the ventilation system. Effective control of hazardous air substances requires that systems be designed to effectively capture and exhaust contaminants away from the workers' breathing area, ensuring a safer work environment.