---
kind: "section"
citation: "30 C.F.R. § 57.22207"
title: "30"
number: "57.22207"
heading: "Booster fans (I-A, II-A, III, and V-A mines)."
url: "https://uscodex.org/cfr/30/57.22207"
---

# §57.22207. Booster fans (I-A, II-A, III, and V-A mines).

- (a) Booster fans shall be approved by MSHA under the applicable requirements of [30 CFR part 18](/cfr/30/part18.md), and be—
  - (1) Provided with an automatic signal device located so that it can be seen or heard by a person designated by the mine operator to give an alarm when the fan stops or when methane reaches the following levels:
    - (i) 1.0 percent at the fan in Subcategory I-A, Category III, and Subcategory V-A mines; and
    - (ii) 0.5 percent at the fan in Subcategory II-A mines.
  - (2) Equipped with a device that automatically deenergizes power in affected workings should the fan stop; and
  - (3) Equipped with starting and stopping controls located at the fan and at another accessible remote location.
- (b) Booster fan installations, except for booster fans installed in ducts, shall be—
  - (1) Provided with doors which open automatically when all fans in the installation stop; and
  - (2) **Provided with an air lock when passage through the fan bulkhead is necessary.**

## Notes

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 52 FR 24941, July 1, 1987, unless otherwise noted.

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.