40 CFR § 211.206-2 - Alternative test data.

---
identifier: "/us/cfr/t40/s211.206-2"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 211.206-2 - Alternative test data."
title_number: 40
title_name: "Protection of Environment"
section_number: "211.206-2"
section_name: "Alternative test data."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "G"
subchapter_name: "NOISE ABATEMENT PROGRAMS"
part_number: "211"
part_name: "PRODUCT NOISE LABELING"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
regulatory_source: "44 FR 56127, Sept. 28, 1979, unless otherwise noted."
cfr_part: "211"
---


# 211.206-2 Alternative test data.

(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.

[45 FR 8275, Feb. 6, 1980]