Respirator Mask Filters

FILTERS by themselves do not protect against chemicals, gases or vapors and are intended only for low-level hazards.

Particulate respirators are considered air-purifying respirators because they clean particles out of the air as you breathe.

The common “N-95” filtering respirator is one type of particulate respirator, often used in hospitals to protect against infectious agents. Respirator Filters

The National Institute of Occupational Safety and Health (NIOSH) classifies filters in two ways, Type and Efficiency.

TYPE

  • N) Not for use in atmospheres that contain oil-based aerosols.
  • R) Restricted to eight hours of service life, if used in atmospheres that do contain oil-based aerosols.
  • P) Oil Proof. May be used without restrictions in atmospheres that contain oil based aerosols.

    EFFICIENCIES (Filtering Airborne Particles)

  • 95 = Filters at least 95%
  • 99 = Filters at least 99%
  • 100 = Filters at least 99.97%

    Note: Note: Combining Type and Efficiency creates a NIOSH classification. The table below lists possible filter groupings, or classifications.

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