Appendix C: Terminology
51
Air-purifying respirator (APR)
a respirator with
a filter, cartridge, or canister that removes
specific air contaminants by passing ambient air
through a purifying element.
Atmosphere-supplying respirator
a respirator
that supplies the user with breathing air from a
source independent of the ambient atmosphere
and includes supplied-air respirators (SARs) and
self-contained breathing apparatus (SCBA) units.
Condensation Nuclei Counting (CNC
) method
of Quantitative fit testing (QNFT) also known as
ambient aerosol which measures aerosol
concentration inside the breathing zone of a
respirator and outside of the respirator with the
use of a probe. The aerosols measured inside the
respirator are assumed to be the result of
leakage.
Controlled Negative Pressure (CNP)
method of
Quantitative fit testing (QNFT) that pulls and
maintains a negative pressure inside a respirator
by removing, and directly measuring, any air that
leaks into the facepiece.
Fit factor
a numerical representation of the fit
of a respirator to a specific individual; typically
estimating the ratio of the concentration of a
substance in ambient air to its concentration
inside the respirator when worn.
Fit test
the use of a protocol to qualitatively or
quantitatively evaluate the fit of a respirator on
an individual.
Powered air-purifying respirator (PAPR
) an
air-purifying respirator that uses a blower to
force the ambient air through air-purifying
elements to the respirator inlet covering.
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.
Self-contained breathing apparatus (SCBA)
an
atmosphere-supplying respirator for which the
breathing air source is designed to be carried by
the user.
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.
User seal check
an action conducted by the
respirator user to determine if the respirator is
properly seated to the face.
Summary of Contents for QuantiFit 2
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