Respiratory protection

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What is the relationship between OSHA permissible exposure limits/maximum use concentrations and assigned protection factors?

If I can get a worker with facial hair to pass a quantitative fit test using a PortaCount, can I then allow that worker to wear the full facepiece without him needing to shave?

What are the benefits of powered air purifying systems versus negative pressure systems?

A large number of men at our facility have beards, and I’m concerned that this could create problems with their respiratory protection. Can you provide any advice?