When testing air inside a permit-required confined space, how should the air be tested?

Testing the air in a permit-required confined space from top to bottom is important due to the stratification of gases that can occur within such environments. Different gases can accumulate at different levels; for example, lighter gases like methane may rise to the top, while heavier gases such as carbon dioxide can settle at the bottom. By testing throughout the vertical space, you ensure that you identify the presence of hazardous gases, ensuring the safety of workers entering the confined space.

This thorough approach is vital for detecting low-oxygen areas or toxic gas concentrations that could pose a risk to personnel. It aligns with OSHA guidelines, which emphasize the necessity of understanding the air quality throughout the entirety of the space. This methodical inspection allows for comprehensive safety assessments, thus minimizing potential risks associated with confined spaces.