---
kind: "section"
citation: "30 C.F.R. § 57.4504"
title: "30"
number: "57.4504"
heading: "Fan installations."
url: "https://uscodex.org/cfr/30/57.4504"
---

# §57.4504. Fan installations.

- (a) Fan houses, fan bulkheads for main and booster fans, and air ducts connecting main fans to underground openings shall be constructed of noncombustible materials.
- (b) Areas within 25 feet of main fans or booster fans shall be free of combustible materials, except installed wiring, ground and track support, headframes, and direct-fired heaters. Other timber shall be coated with one inch of shotcrete, one-half inch of gunite, or other noncombustible materials.

## Notes

### Authority

Authority: Sec. 101, Federal Mine Safety and Health Act of 1977, Pub. L. 91-173 as amended by Pub. L. 95-164, 91 Stat. 1291 (30 U.S.C. 811).

### Authority

Authority: 30 U.S.C. 811.

### Source

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