RESPIRATORY PROTECTION –
Definition of Terms
Air
Purifying Respirator is a respirator with an air purifying filter, cartridge,
or canister that removes specific air contaminants by passing ambient air
through the air purifying element.
Atmosphere-supplying
Respirator which supplies the user with breathing air from a source independent
of the ambient atmosphere, including supplied-air respirators (SARs) and
self-contained breathing apparatus (SCBA) units.
Demand
Respirator - An atmosphere supplying respirator that admits breathing air to
the face piece only when negative pressure is created inside the face piece by
inhalation.
End-of-Service-Life-Indicator
(ESLI) - A system that warns the respirator user of the approach of the end of
adequate respiratory protection; for example, the sorbent is approaching
saturation or is no longer adequate.
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Escape-only
Respirator which is intended to be used only for emergency exit.
Filtering
Face Piece (dust mask) - A negative pressure particulate respirator with a
filter as an integral part of the face piece or with the entire face piece
composed of the filtering medium.
Fit Factor –
Its an quantitative estimate of the fit of a particular respirator to a
specific individual; typically estimates the ratio of the concentration of a
substance in ambient air to its concentration inside the respirator when worn.
Fit Test - The
use of protocol to qualitatively or quantitatively evaluate the fit of a
respirator on an individual. (See Qualitative Fit Test (QLFT) and Quantitative
Fit Test (ANFT).)
High Efficiency Particulate Air (HEPA) Filter - A filter that is at least 99.97% efficient in removing monodisperse particles of 0.3 micrometers in diameter. The equivalent NIOSH 42 CFR 84 particulate filters are the N100, R1000, and P100 filters.
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Immediately
Dangerous to Life or Health (IDLH) - An atmosphere which poses an immediate
threat to life, would cause irreversible adverse health effects, or would
impair an individual’s ability to escape from a dangerous atmosphere.
Loose-fitting
Facepiece - A respiratory inlet covering that is designed to form a partial
seal with the face.
Negative
Pressure Respirator (tight fitting) - A respirator in which the air pressure
inside the facepiece is negative during inhalation with respect to the ambient
air pressure outside the respirator.
Oxygen
Deficient Atmosphere - An atmosphere with an oxygen content below 19.5% by
volume.
Positive
Pressure Respirator - A respirator in which the pressure inside the respiratory
inlet covering exceeds the ambient air pressure outside the respirator.
Powered Air-purifying Respirator (PAPR) - An air-purifying respirator that uses a blower to force the ambient air through the air-purifying elements to the inlet covering.
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Pressure
Demand Respirator - A positive pressure atmosphere-supplying respirator that
admits breathing air to the facepiece when the positive pressure is reduced
inside the facepiece by inhalation.
Qualitative
Fit Test (QLFT) - A pass/fail test to assess the adequacy of respirator fit
that relies on the individual’s response to the test agent.
Quantitative
Fit Test (QNFT) - An assessment of the adequacy of respirator fit by
numerically measuring the amount of leakage into the respirator.
Service
Life - The period of time that a respirator, filter or sorbent, or other
respiratory equipment provides adequate protection to the wearer.
Supplied
–Air Respirator (SAR) or Airline Respirator - An atmosphere-supplying
respirator for which the source of breathing air is not designed to be carried
by the user.
Tight-fitting
Facepiece - A respiratory inlet covering that forms a complete seal with the
face.
User Seal Check - An action conducted by the respirator user to determine if the respirator is properly sealed to the face.
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