30 CFR § 77.305 - Access to drying chambers, hot gas inlet chambers and ductwork; installation and maintenance.

---
identifier: "/us/cfr/t30/s77.305"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 77.305 - Access to drying chambers, hot gas inlet chambers and ductwork; installation and maintenance."
title_number: 30
title_name: "Mineral Resources"
section_number: "77.305"
section_name: "Access to drying chambers, hot gas inlet chambers and ductwork; installation and maintenance."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "O"
subchapter_name: "COAL MINE SAFETY AND HEALTH"
part_number: "77"
part_name: "MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL 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: "36 FR 9364, May 22, 1971, unless otherwise noted."
cfr_part: "77"
---


# 77.305 Access to drying chambers, hot gas inlet chambers and ductwork; installation and maintenance.

Drying chambers, hot gas inlet chambers and all ductwork in which coal dust may accumulate shall be equipped with tight sealing access doors which shall remain latched during dryer operation to prevent the emission of coal dust and the loss of fluidizing air.