Any time you enter a confined space to perform work, it’s dangerous. There are risks that need to be accounted for to maximize safety and minimize danger. The biggest potential hazard is one that is usually invisible and almost always odorless. It’s the very air inside the confined space. It may look harmless but what may appear as safe, clean air may actually be oxygen deficient, filled with toxins or flammable gases or both. The atmosphere of any confined space must be thoroughly tested before entering. And once hazards are found, a ventilation system must be implemented to ensure that all those who are entering the space have a safe and breathable atmosphere.
This presentation explains mechanical ventilation, why it is necessary, when it is necessary and how to ventilate safely and effectively.
DVD – Dupont