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APF / Assigned Protection Factor
The protection factor is the ratio of the contaminant concentration divided by the exposure limit (usually PEL or TLV). For example if the PEL is 100 ppm and the protection factor is 10, then the user will be protected against concentrations up to 1000 ppm.
APR
Air Purifying Respirator.
CBRN
Chemical Biological Radiological Nuclear: This is the term often used for terrorist attack situations.
PAPR
Powered Air-Purifying Respirator
PEL / Permissible Exposure Limit
This is the contaminant concentration that OSHA enforces. Subpart Z of 1910.1000 contains tables with contaminants and their PELs.
Pressure Demand
A positive pressure atmosphere-supplying respirator that admits breathing air to the facepiece when the positive pressure is reduced inside the facepiece by inhalation. Reference: 29CFR1910.134(b)
PSI
Pounds per Square Inch: This is pressure.
SAR
Supplied Air Respirator.
SCBA
Self-Contained Breathing Apparatus: Bullard does not sell this type of respirator. Bullard does sell an ESCBA which is a Pressure Demand Supplied Air Respirator with SCBA style egress bottle (Part No. SPECPDE).
TLV / Threshold Limit Value
This is the contaminant concentration limit that American Conference of Government Industrial Hygienists (www.acgih.org) updates each year and is sometimes more stringent than the PEL.


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