Page 26 of 48P/N 595279-01 Rev. B 5/14
DONNING PROBLEMS
1. Perform a personal check of the Facepiece and Head Harness and
address any donning problems. OSHA standard 29 CFR 1910.134
requires teams of at least two people for situations where this type of
equipment is used. Have your partner help you verify the facepiece
is donned properly.
Possible problems include:
a) Head Harness Strap twisted,
b) Head Harness off-center or not flat against the head,
c) Head Harness too high on the head,
d) Hair or clothing in the face seal,
e) Face seal rolled over inside the facepiece rather than flat against
the face
f) Facepiece is sitting too low on the face as evidenced by pressure
on the forehead or the facepiece making contact with the throat
area permitting a break in the seal.
The illustrations below depict the AV-3000 HT.
If any donning problems are found, remove the facepiece and re-don
the facepiece correctly.
2. Proceed to the BEGIN USE OF THE RESPIRATOR section of this
instruction and perform a NEGATIVE PRESSURE LEAK TEST as
instructed.
WARNING
IF ANY DONNING PROBLEMS ARE
FOUND, REMOVE THE FACEPIECE AND
RE-DON IT CORRECTLY. USE OF AN
IMPROPERLY DONNED FACEPIECE MAY
LEAD TO EXPOSURE TO THE HAZARDOUS
ATMOSPHERE WHICH COULD RESULT IN
SERIOUS INJURY OR DEATH.
USE OF RESPIRATOR CONTINUED...
FIGURE 12
DONNING PROBLEMS
HARNESS STRAP
TWISTED
HEAD HARNESS
OFF CENTER
HEAD HARNESS
TOO HIGH
FACE SEAL
ROLLED OVER
FACEPIECE
TOO LOW
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