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

The P-series filters are specifically designed to protect against particulates that may be oil-based, making them appropriate for environments where oil aerosols are present. This is essential for maintaining respiratory safety, as P-series filters are tested and rated for effectiveness against both solid and liquid aerosols, including those that involve oil.

In contrast, the N-series filters, while effective against non-oil particulates, do not provide protection against oil-based aerosols, limiting their effectiveness in certain settings where oil is present. Dust masks typically offer minimal protection and are not suited for environments with hazardous particulates. Organic vapor cartridges focus on gases and vapors rather than solid or liquid particulates, making them unsuitable for filtering out particulates that may come with exposure to oil. Thus, the P-series is the correct selection for scenarios where oil aerosol particles may occur, ensuring both safety and compliance with respiratory protection standards.