When oil may be present, which particulate filter must be used?

The P-series particulate filters are specifically designed to be resistant to oil aerosols, making them the appropriate choice when there is a possibility of oil exposure in the environment. These filters are classified as particulate filters that can be used in areas where both solid and liquid particulates, including oil mists, may be present.

In contrast, N-series filters are not resistant to oil and are typically recommended for environments where only non-oil-based particulates are encountered. R-series filters are somewhat resistant to oil but have limitations regarding their use in environments with oil. The PF-series, while relevant in certain contexts, does not specifically address the need for oil resistance in the same way that P-series filters do.

Thus, when working in conditions where oil could be present, choosing a P-series filter ensures compliance with safety standards and protection against potential respiratory hazards related to both solid and liquid particles.