30 CFR § 57.22208 - Auxiliary fans (I-A, II-A, III, and V-A mines).

---
identifier: "/us/cfr/t30/s57.22208"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 57.22208 - Auxiliary fans (I-A, II-A, III, and V-A mines)."
title_number: 30
title_name: "Mineral Resources"
section_number: "57.22208"
section_name: "Auxiliary fans (I-A, II-A, III, and V-A mines)."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "K"
subchapter_name: "METAL AND NONMETAL MINE SAFETY AND HEALTH"
part_number: "57"
part_name: "SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 811."
regulatory_source: "50 FR 4082, Jan. 29, 1985, unless otherwise noted."
cfr_part: "57"
---


# 57.22208 Auxiliary fans (I-A, II-A, III, and V-A mines).

(a) Auxiliary fans, except fans used in shops and other areas which have been so designed that methane cannot enter the airway, shall be approved by MSHA under the applicable requirements of 30 CFR part 18, and be operated so that recirculation is minimized. Auxiliary fans shall not be used to ventilate work places during the interruption of normal mine ventilation.

(b) Tests for methane shall be made at auxiliary fans before they are started.