Authority: IC 15-16-1-6; IC 15-16-1-7

Affected: IC 15-16-1

Sec. 20. "Gas mask" means an air purifying device with full facepiece approved by NIOSH/MSHA under the provisions of 30 CFR Part II, Subpart I for use in an ammonia contaminated atmosphere in compliance with 29 CFR 1910.134 and selected in accordance with ANSI Z88.2, Respiratory Protection, including current amendments and latest edition of the same. A gas mask of the air purifying type must be used in an atmosphere containing nineteen and five-tenths percent (19.5%) to twenty-two percent (22.0%) oxygen by volume.

(State Chemist of the State of Indiana; 355 IAC 3-1.5-20; filed Jan 19, 2001, 2:04 p.m.: 24 IR 1625; errata filed Apr 24, 2001, 9:06 a.m.: 24 IR 2709; readopted filed Jun 20, 2001, 3:22 p.m.: 24 IR 3822; readopted filed Apr 27, 2007, 2:03 p.m.: 20070509-IR-355070039RFA; readopted filed Nov 25, 2013, 3:27 p.m.: 20131225-IR-355130482RFA; readopted filed Jul 2, 2019, 10:42 a.m.: 20190731-IR-355190258RFA; readopted filed Nov 4, 2025, 2:37 p.m.: 20251119-IR-355240619RFA)