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rinsed in water, shaken to dry, and refilled at shall be replenished using one half the number
least each morning and afternoon or at least of squeezes used initially (e.g., 5, 10 or 15).
every four hours.
(10) The test subject shall indicate to the test
(b) Bitrex Solution Aerosol Fit Test Procedure. conductor if at any time during the fit test the
taste of Bitrex is detected. If the test subject
(1) The test subject may not eat, drink (except does not report tasting the Bitrex, the test is
plain water), smoke, or chew gum for 15 min- passed.
utes before the test.
(11) If the taste of Bitrex is detected, the fit is
(2) The fit test uses the same enclosure as that deemed unsatisfactory and the test is failed. A
described in 4. (a) above. different respirator shall be tried and the entire
test procedure is repeated (taste threshold
(3) The test subject shall don the enclosure screening and fit testing).
while wearing the respirator selected according
to section I. A. of this appendix. The respirator 5. Irritant Smoke (Stannic Chloride) Protocol
shall be properly adjusted and equipped with
any type particulate filter(s). This qualitative fit test uses a person’s response
to the irritating chemicals released in the
(4) A second DeVilbiss Model 40 Inhalation “smoke” produced by a stannic chloride venti-
Medication Nebulizer or equivalent is used to lation smoke tube to detect leakage into the
spray the fit test solution into the enclosure. respirator.
This nebulizer shall be clearly marked to dis-
tinguish it from the screening test solution (a) General Requirements and Precautions
nebulizer.
(1) The respirator to be tested shall be
(5) The fit test solution is prepared by adding equipped with high efficiency particulate air
337.5 mg of Bitrex to 200 ml of a 5% salt (HEPA) or P100 series filter(s).
(NaCl) solution in warm water.
(2) Only stannic chloride smoke tubes shall be
(6) As before, the test subject shall breathe used for this protocol.
through his or her slightly open mouth with
tongue extended, and be instructed to report if (3) No form of test enclosure or hood for the
he/she tastes the bitter taste of Bitrex. test subject shall be used.
(7) The nebulizer is inserted into the hole in the (4) The smoke can be irritating to the eyes,
front of the enclosure and an initial concentra- lungs, and nasal passages. The test conductor
tion of the fit test solution is sprayed into the shall take precautions to minimize the test
enclosure using the same number of squeezes subject’s exposure to irritant smoke. Sensitivity
(either 10, 20 or 30 squeezes) based on the varies, and certain individuals may respond to a
number of squeezes required to elicit a taste re- greater degree to irritant smoke. Care shall be
sponse as noted during the screening test. taken when performing the sensitivity screening
checks that determine whether the test subject can
(8) After generating the aerosol, the test subject detect irritant smoke to use only the minimum
shall be instructed to perform the exercises in amount of smoke necessary to elicit a response
section I. A. 14. of this appendix. from the test subject.
(9) Every 30 seconds the aerosol concentration (5) The fit test shall be performed in an area with
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