Loading ...
Loading ...
Loading ...
13
the same organ system are present,
consideration should be given to the
combined eect rather than individual
eects. Consult the current TLVs
®
and documentation published by the
American Conference of Governmental
Industrial Hygienists for more
information and the appropriate formula.
If combined eects are considered,
calculate the hazard ratio for the mixture.
b) If no, go to Step 11.
11. Are any of the respirators listed in the last
column a particulate lter respirator (i.e.,
does it have an N, R or P lter?)?
a) If yes, go to Step 12.
b) If no, go to Step 14.
12. Are only N-series particulate lter
respirator(s) listed?
a) If yes, go to Step 13.
b) If no, go to Step 14.
13. Is airborne oil mist present at a
concentration greater than 0.1 mg/m³
but less than the value in the OEL column
of the guide? (If a respirator is not being
selected for oil, the presence of the oil
must still be considered when choosing the
appropriate lter.)
a) If yes, a respirator with either an
R- or P-series or HEPA
filter must be
selected. R-series filters must be
changed after 8 hours use or after the
respirator is loaded with or exposed to
200 mg of aerosol. The manufacturer’s
service time recommendation must be
followed for P-series filters. Record the
respirator with the R- or P-series filter
that is being selected. Go to Step 14.
b) If no, go to Step 14.
14. Was more than one respirator type
required for the specific exposure situation
(i.e., is there more than one respirator code
included in the list made in the
last column of the form?)?
a) If yes, note all respirators
recommended. If your list contains
more than one respirator and all are air-
purifying respirators, select the one
with the highest assigned protection
factor (see page 2) and one that
removes all of the contaminants, if
available.
If SA or SA(F) is one of the
respirators listed, this respirator must
be selected over all others. If any of
the respirator codes contain the (F)
designation, respirators with half
facepieces cannot be used unless
appropriate eye protection is also
worn. If no air-purifying respirator
will provide the protection required,
select SA or SA(F). Go to Step 17.
b) If no, record the respirator listed
as the final respirator selected
(bottom line). Go to Step 17.
15. If the chemical is not listed in the guide,
either it is a pesticide or an occupational
exposure limit was not located.
If an
acceptable exposure level is not known, a
respirator cannot be recommended.
If you
have an exposure level for the material
and would like help, go to Step 17. If no
exposure limit is known, go to Step 16.
16. These conditions (unknown, <19.5%
oxygen, airborne concentration >IDLH)
are generally considered as IDLH or the
hazard ratio exceeds 1000.
Select either a
positive pressure self-contained breathing
Loading ...
Loading ...
Loading ...