Document dQnaL7aXN3jggNrN6G4n3wyge

Federal Register / Vol. SI, No. 119 / Friday. June 20, 1986 / Rules and Regulations 22765 Calculations 21. Calculate and report.fiber density on the niter, E (fibers/mm^; by dividing the total fiber count. F; minus the mean field blank count. D. by the number of fields, n; and the field area. A* (0.00765mmHor a properly calibrated Walton-Beckett graticule): E '-------- fibers/mm2 (n)(Af) 221 Calculate the concentration. C (f/cc). of fibers in the air volume sampled. V (L). using the effective collection area of the filter, A* (385 mm * for a 25-mm filter): c_(EMAc) VtIO5) Note.--Periodically check and adjust the value of A, if necessary. Appendix C to 1926.58--Qualitative and Quantitative Fit Testing Procedures-- Mandatory Qualitative Fit Test Protocols 1. Isoamyl Acetate Protocol A. Odor threshold screening.- . 1. Three l-liler glass fare with metal lids (e.g. Mason or Bell fare) are required. 2- Odor-free water (e.g. distilled or spring water) at approximately 25 *G shall be used for the solutions. 3. The'isoamyl acetate (IAA) (also known as isoperityl acetate) stock solution is ~ prepared by- adding 1 ccof pure IAA to 600 cc of-odor freewateririalditerjar and shaking' for 30 seconds: This solution shall be prepared new et least weekly. 4. The screening test shall be conducted In a room separate from the room used for actual Fit testjng.The.tWo rooms shall be well ventilated but sHali'not be connected to the same recirculating ventilation' system. 5. The odor test-solution is prepared in a second jar by. placing 0.4:cc of the stock solution Into SiOO.cc'of odor free water using a dean dropper or pipette. Shake for 30 seconds and allow to stand for two to three ' minutes so thiatlhe IAA concentration above the'liquid may reach equilibrium.:This solution may be used for only one day. 6. A test blank is prepared in a third jar by adding 50b ccof odor free water.' - 7. The odor test'and test blank fare shall be labelled 1 and 2 for jar identification; If the labels are put on the lids theycan be periodically peeled, dried off and switched to maintain the integrity of-the test; 8. The following Instructions shall be typed on a card and placed oh-the table in front.of the two test fare (i.e. 1 and 2): `.The purpose of this.test is to-determine if you can smellbanana oil at a low, concentration. The two bottles in front of you contain water. One of these bottles also contains a small amount of banana oil. Be sure the covers are.on tight, then shake each bottle for two seconds. . Unscrew the lid of each bottle, oneabatime. and snifT at the mouth of the bottle. Indicate to the test conductor which bottle contains banana oil" 0. The mixtures used in the IAA odor detection test shall be prepared in an area separate from where the test is performed, in order to prevent olfactory fatigue in the subject. 10. If the test subject is unable to correctly identify the jar containing the odor test solution, the IAA qualitative fit test may not be used. 11. If the test subject correctly identifies the far containing the odor test solution, the test subject may proceed to respirator selection and fit testing. B. Respirator Selection.. . ... 1. The test subject shall be allowed to pick the most comfortable respirator from a selection including respirators of various sizes from different manufacturers. The ' selection shall include at least five sizes of elastomeric half facepieces, from at least two manufacturers. 2. The selection process shall be conducted in a room separate from the fit-test chamber to prevent odor fatigue. Prior to the selection process, the test subject shall be shown how to pul on a respirator, how it should be positioned on the face, how to set strap tension and how to determine a "comfortable" respirator. A mirror shall be available to assist the subject in evaluating the fit and positioning of the respirator. This instruction may not constitute, the subject's formal training on respirator use, as it is only a review. 3. The test subject should understand that the employee is being asked to select the respirator which provides the most comfortable fit. Each respirator represents a different size and shape and, if fit properly and used properly will provide adequate protection. 4. The teBt subject holds each facepiece up to the face and eliminates ihose which obviously do not give a comfortableTit. Normally.-selection will begin with a halfmask and if a good fit cannot be found, the subject will be asked to test the full facepiece respirators. (A small percentage of users will not be able to wear any half-mask.) 5. The more comfortable facepieces are noted; the most-comfortable mask is donned and worn at least five minutes to assess comfort. All donning and adjustments of the facepiece shall be performed by ihe test subject without assistance from the test conductor or other person. Assistance in : assessing comfort can be given by discussing the points in #6 below. If the test subject is not familiar with using a particular respirator, the test subject shall be directed to don the mask several times and to adjust the sirups each time to become.adept at setting proper . tension on the straps. . 6. Assessment of comfort shall include reviewing the.following points with the lest subject and allowing the lest subject adequate time to determine the comfort of the respirator: . Positioning of mask on nose. Room for eye protection. Room to talk. Positioning mask on face and cheeks. 7. The following criteria shall be used'to help determine the adequacy of the respirator fit: Chin properly placed. Strap tension. Fit across nose bridge. Distance from nose to chirk Tendency to slip. Self-observation in mirror. 8. The test subject shall conduct the conventional negative and positive-pressure fit checks before conducting the negative- or positive-pressure test the subject shall be told to "seat" the mask, by rapidly moving the head from side-to-side and up and down, while taking a few deep breaths. 9. The test subject is now ready for fit testing. 10. After passing the fit test, the test subject shall be questioned again regarding the comfort of the respirator. If it has become uncomfortable, another model of respirator shall be tried. 11. The employee shallbe given the opportunity to select a different facepiece and be retested if the chosen facepiece becomes increusingly uncomfortable at any time. C. Fit test. 1. The fit test chamber shall be similar to a clear 55 gal drum liner suspended inverted over a 2 foot diameter frame, so that the top of the chamber is about 6 inches above the test subject's head. The inside top center of the chamber shall have a smell hook attached. 2. Each respirator used for the fitting and fit testing shallbe equipped with organic vapor cartridges or offer protection against organic vapors. The cartridges or masks shall be changed at least weekly. 3. After selecting, donning, and properly ' adjusting a respirator, the test subject' shall . wear it to.the fit.testingroom. This room'shali be separate from the room used for odor threshold screening and respirator selection, and shall be well ventilated, as by an exhaust. fan or lab hood, to prevent general room contamination. 4. A copy of the following test exercises and rainbow passage.shall be taped to the . inside of the test chamber. Test Exercises i. Breathe normally, . . i\. Breathc deeply. Be certain breaths ore deep and regular. .. iii. Turn head all the way from one side to the other. Inhale on each 9ide. Be certain movement is complete. Do not bump the . respirator against the shoulders. iv; Nod head up-and-down. Inhale when head is in the full up position (looking toward ceiling). Be certain motions are complete and made about every second: Do not bump the respirator on the cheat.' y. Talking. Talk.aloud and slowly for several minutes. The following paragraph i9 called the Rainbow Passage. Reading it will result in a wide range of facial movements, and thus be useful to satisfy this requirement. GLEASON-OOI013