Type of
Respirator Type of Facepiece
Quarter Half Full
Air-purifying 5 10 100
Atmosphere-supplying SCBA (demand) - 10 100
Airline (demand) - 10 100
Respiratory Inlet Covering
Half Full Helmet Loose Fitting
Mask Face Hood Facepiece
Powered air-purifying (HEPA) 50 1000 1000 25
Powered air-purifying (DMF) -- 100 100 --
Atmosphere-supplying
Airline-pressure demand 50 1000 --
Continuous flow 50 1000 1000 25
SCBA (positive-pressure or
open/closed circuit) -- (< 1000) -- --
NOTES:
1. APF are not applicable for escape-type respirators.
2. Combination respirators such as airline respirators equipped with an air-purifying filter should have the APF assigned on the basis of the mode of operation. For example, if the combination respirator is to be used on both the airline mode as well as the air-purifying mode, then the APF applicable to that respirator in the air-purifying mode applies.
3. The maximum concentration against which an air-purifying respirator will protect is determined by the design efficiency and capacity of the cartridge, canister, or filter and the facepiece-to-face seal on the user. For gases and vapours, the maximum concentration for which the air-purifying respirator is designed to be used in the appropriate assigned protection factor multiplied by the exposure limit (EL). However, air-purifying respirators are not to be used for entry into concentrations of contaminants which are at or above IDLH.
4. The above APF values are similar to values proposed in a new edition of ANSI Standard Z88.2 currently in preparation.
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