What percent of the zones must be tested at the outlet most remote from the source to verify the piping particulate test?

To determine the percentage of zones that must be tested at the outlet most remote from the source for verifying the piping particulate test, it is important to refer to industry standards and best practices related to medical gas systems. According to guidelines, including those from the National Fire Protection Association (NFPA) and the American National Standards Institute (ANSI), a significant portion of the system is typically sampled to ensure the effectiveness of filtration and overall system integrity.

Testing 25% of the zones at the outlet most remote from the source is established to provide a representative sample of the entire system. This percentage is designed to ensure that any potential particulate contamination in the gas can be accurately assessed, giving confidence that the gas delivered to patient care areas meets safety and quality standards.

Testing a smaller percentage may not adequately capture the system's overall cleanliness and could lead to undetected issues in the piping system. This approach is a critical aspect of maintaining compliance with regulations and ensuring patient safety in healthcare environments that depend on medical gas systems. Hence, the choice of 25% aligns with best practices in the field.