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  Air Purifying Respirators (APR) Supplied Air Respirators (SAR) APR Filter Types

When? What? How Much? Approaches for Estimating Worker Exposures

To select an appropriate respirator, the employer must: · Conduct an exposure assessment to determine the type and amount of hazardous exposure · Consider the factors that can influence respirator selection such as job site and worker characteristics · Understand the assigned protection factors ·