CFR > Title 30 - Mineral Resources > CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR > SUBCHAPTER O—COAL MINE SAFETY AND HEALTH (parts 70 to 90) > PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES > SUBPART D—Thermal Dryers (§77.300 to §77.315) > 77.304—Explosion release vents.

77.304—Explosion release vents.

Drying chambers, dry-dust collectors, ductwork connecting dryers to dust collectors, and ductwork between dust collectors and discharge stacks shall be protected with explosion release vents which open directly to the outside atmosphere, and all such vents shall be:
(a) Hinged to prevent dislodgment;
(b) Designed and constructed to permit checking and testing by manual operation; and
(c) Equal in size to the cross-sectional area of the collector vortex finder when used to vent dry dust collectors.