C.F.R. » Title 42 » CHAPTER I—PUBLIC HEALTH SERVICE, DEPARTMENT OF HEALTH AND HUMAN SERVICES › SUBCHAPTER G—OCCUPATIONAL SAFETY AND HEALTH RESEARCH AND RELATED ACTIVITIES › PART 84—APPROVAL OF RESPIRATORY PROTECTIVE DEVICES › Subpart K—Air-Purifying Particulate Respirators

42 C.F.R. § 84.181

Communication performance test—PAPR class PAPR100

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(a) Powered air-purifying respirators must be designed to allow for proper communication while worn.

(b) A Modified Rhyme Test 7 will be used to test the wearer's ability to communicate efficiently.

7 The Modified Rhyme Test is used in speech intelligibility experiments. See https://www.nist.gov/ctl/pscr/modified-rhyme-test-audio-library.

(c) The communications requirement is met if the overall performance rating is greater than or equal to 70 percent.