(a) In lieu of testing according to § 211.206–1, manufacturers may use the latest available test data obtained according to ANSI
STD Z24.22–1957 or ANSI STD S3.19–1974 to determine the mean attenuation and standard
deviation for each test frequency and the NRR calculated from those values. Manufacturers whose data is based on the ANSI STD Z24.22–1957 measurement procedure
must state in the supporting information required by § 211.204–4 that the mean attenuation and standard deviation values used to calculate the NRR
are based on ANSI STD Z24.22–1957.
(b) Manufacturers who initially use available data based on ANSI STD Z24.22–1957 must
retest within one year of the effective date of this regulation (by September 27,
1981) the affected categories of hearing protectors in accordance with § 211.206–1
of the regulation, and must relabel those categories as necessary.
(c) Manufacturers who use available data based on ANSI STD S3.19–1974 are not required
to retest the affected categories of hearing protectors.
(d) If a manufacturer has both ANSI STD S3.19–1974 test data and ANSI STD Z24.22–1957
test data on a hearing protector category, that manufacturer must use the data obtained
according to ANSI STD S3.19–1974.
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