Regulatory Text
30 C.F.R. § 57.4504 — Fan installations.
§ 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.
Source: ecfr.gov · govinfo.gov — public domain
Official Source ↗
Root-LD Entity Data
◈ Machine-Readable Provenance Record
Root-LD v1.0 · boisestandard.org
Federation ID
BS-CFR30-SEC-54B99B
Entity Class
REGULATION / FEDERAL-CFR-SECTION
Domain Signature
boisestandard.org
Citation
30 C.F.R. § 57.4504
Corpus
CFR — Code of Federal Regulations
Status
✓ ACTIVE
Source
PRIMARY-SOURCE
Source Verified
✓ TRUE
Content Hash
5a2c98244efbd9e2...
Semantic Edges
Pending — corpus passes queued
The regulatory text of 30 C.F.R. § 57.4504 is reproduced from the official Code of Federal Regulations as published by the Office of the Federal Register and the National Archives and Records Administration.
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Title 30 — Mineral Resources
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30 C.F.R. — public domain
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