30 C.F.R. § 77.304 Explosion release vents.
Title 30 - Mineral Resources
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.
Title 30: Mineral Resources
PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES
Subpart D—Thermal Dryers
§ 77.304 Explosion release vents.
