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Note to paragraph 3. (a): If the test subject eats (7) The nebulizer is inserted into the hole in
or drinks something sweet before the screening the front of the enclosure and an initial concen-
test, he/she may be unable to taste the weak tration of saccharin fit test solution is sprayed
saccharin solution. into the enclosure using the same number of
squeezes (either 10, 20 or 30 squeezes) based
(12) If a taste response is elicited, the test sub- on the number of squeezes required to elicit a
ject shall be asked to take note of the taste for taste response as noted during the screening
reference in the fit test. test. A minimum of 10 squeezes is required.
(13) Correct use of the nebulizer means that ap- (8) After generating the aerosol, the test subject
proximately 1 ml of liquid is used at a time in shall be instructed to perform the exercises in
the nebulizer body. section I. A. 14. of this appendix.
(14) The nebulizer shall be thoroughly rinsed (9) Every 30 seconds the aerosol concentration
in water, shaken dry, and refilled at least each shall be replenished using one half the original
morning and afternoon or at least every four number of squeezes used initially (e.g., 5, 10 or
hours. 15).
(b) Saccharin solution aerosol fit test procedure. (10) The test subject shall indicate to the test
conductor if at any time during the fit test the
(1) The test subject may not eat, drink (except taste of saccharin is detected. If the test subject
plain water), smoke, or chew gum for 15 min- does not report tasting the saccharin, the test is
utes before the test. passed.
(2) The fit test uses the same enclosure de- (11) If the taste of saccharin is detected, the fit
scribed in 3. (a) above. is deemed unsatisfactory and the test is failed.
A different respirator shall be tried and the en-
(3) The test subject shall don the enclosure tire test procedure is repeated (taste threshold
while wearing the respirator selected in section screening and fit testing).
I. A. of this appendix. The respirator shall be
properly adjusted and equipped with a par- (12) Since the nebulizer has a tendency to clog
ticulate filter(s). during use, the test operator must make peri-
odic checks of the nebulizer to ensure that it is
(4) A second DeVilbiss Model 40 Inhalation not clogged. If clogging is found at the end of
Medication Nebulizer or equivalent is used to the test session, the test is invalid.
spray the fit test solution into the enclosure.
This nebulizer shall be clearly marked to dis- 4. Bitrex™ (Denatonium Benzoate) Solution
tinguish it from the screening test solution Aerosol Qualitative Fit Test Protocol
nebulizer.
The Bitrex™ (Denatonium benzoate) solution
(5) The fit test solution is prepared by adding aerosol QLFT protocol uses the published sac-
83 grams of sodium saccharin to 100 ml of charin test protocol because that protocol is
warm water. widely accepted. Bitrex is routinely used as a
taste aversion agent in household liquids
(6) As before, the test subject shall breathe which children should not be drinking and is
through the slightly open mouth with tongue endorsed by the American Medical Associa-
extended, and report if he/she tastes the sweet tion, the National Safety Council, and the
taste of saccharin. American Association of Poison Control Cen-
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