What type of air does Grade D breathing air refer to?

Grade D breathing air is specifically defined as compressed breathing air that meets certain quality standards established by various regulatory bodies, including the Occupational Safety and Health Administration (OSHA) and the Compressed Gas Association (CGA). This type of air is required for use in respiratory protection equipment and is essential for the safety of personnel who may be exposed to hazardous environments.

The standards for Grade D breathing air ensure that the air is free from contaminants, including harmful levels of carbon monoxide, carbon dioxide, oil, and other particulates. The importance of this air quality lies in its role in safeguarding health during operations that require protective breathing apparatus. Therefore, when discussing Grade D breathing air, it is clear that it must be compressed and meet stringent safety guidelines to ensure it is safe for human inhalation in various situations.