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Chapter 20
| Troubleshooting | Failing Fit Factors
20
Troubleshooting
2. Air inhalation or exhalation, even slightly, creates dramatic changes within the respirator.
Re-instruct the test subject to maintain breath holding during the test measurement.
3. A test subject may be unable to stop the flow of air through the nose while holding his
breath. A nose clip can assist the subject (be sure that the nose clip does not interfere with
the fit if the respirator).
4. Improper breath hold. Instruct the user to relax, take a comfortable breath and hold as if
going under water.
Trouble Passing Fit Test
What do I do when people are not passing a fit test?
This problem could include a number of variables, but most likely would fall into three
categories: instrument failure, respirator fit, or adapter fault. If it's a one-time problem when
other people can pass, the answer simply may be that the respirator is not a good fit on the
subject. When several subjects can't pass, look at the other variables:
1. Instrument Failure
a.
You must do the Daily Verification Check at the beginning of each day.
b.
If the QuantiFit2 finishes passes the daily verification procedure, this assures that the
instrument is operating properly and measuring within tolerance.
c.
If the QuantiFit2 is not able to complete the Daily Verification Check, service will be
needed. Please contact OHD customer service.
2. Respirator/Fit Fault
a.
The Operator must first determine that there is a proper fit. Any facial hair, hair getting
anywhere under the respirator seal, temple hair too far forward, sunken temples or
facial scarring, protrusions or blemishes, having the respirator too loose or too tight, all
can be reason enough to keep the QuantiFit2 from pulling a negative pressure within
the respirator. There are other obstacles that can come into play which are too
numerous to list. With more experience fit testing, it's easier for one to see potential
problems with fit.
b.
To further check on the respirator fit, do a user seal check for 10 seconds. Press the
Seal Check button located on the test screen, and take and take in a breath and hold
the pressure allowing for plenty of suction on the respirator. If after 10 seconds the
respirator “drops” when releasing the Seal Check button, this indicates a good fit. If
after the same procedure there is no drop or "falling away" from the face, this indicates
that all of the air leaked out through a leak source and is the reason for a failed test
step.
c.
Exhalation valves may be dirty or creased allowing air to be pulled into the respirator.
While the inhalation valves must be removed or propped open, the exhalation valve
must remain in place and maintain a good seal. Clean the side of the valve that faces
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