NIOSH air filtration rating

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N95mask

NIOSH air filtration rating

The NIOSH air filtration rating is a classification system used by the National Institute for Occupational Safety and Health (NIOSH) to categorize and rate the efficiency of particulate filtering facepiece respirators (FFRs). This rating system is crucial for ensuring the safety and health of workers who are exposed to airborne contaminants in various occupational settings.

Classification System

The NIOSH air filtration rating system is divided into three main categories based on the filter's resistance to oil and its filtration efficiency:

• N-Series (Not resistant to oil)
• R-Series (Somewhat resistant to oil)
• P-Series (Strongly resistant to oil)

Each series is further classified based on the filter's efficiency at removing airborne particles:

• 95 - Filters at least 95% of airborne particles
• 99 - Filters at least 99% of airborne particles
• 100 - Filters at least 99.97% of airborne particles

For example, an N95 respirator is not resistant to oil and filters at least 95% of airborne particles.

N-Series

The N-Series respirators are not resistant to oil and are suitable for environments where oil-based particulates are not present. The common types include:

• N95 respirator
• N99 respirator
• N100 respirator

R-Series

The R-Series respirators are somewhat resistant to oil and can be used in environments where oil-based particulates are present, but only for a limited time. The common types include:

• R95 respirator
• R99 respirator
• R100 respirator

P-Series

The P-Series respirators are strongly resistant to oil and can be used in environments with oil-based particulates for a longer duration. The common types include:

• P95 respirator
• P99 respirator
• P100 respirator

Importance

The NIOSH air filtration rating system is essential for selecting the appropriate respirator for specific occupational hazards. It ensures that workers are adequately protected from harmful airborne particles, including dust, fumes, and biological agents.

Related Pages

• National Institute for Occupational Safety and Health
• Particulate filtering facepiece respirator
• Occupational safety and health
• Respirator
• Personal protective equipment