30 CFR § 77.304 Mandatory Safety Standards, Surface Coal Mines and Surface Work Areas of Underground Coal Mines

§ 77.304 Explosion release vents.

Current through Jul 27, 2026 · Read all of Part 77

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.

← § 77.303 Hot gas inlet chamber dropout doors.§ 77.305 Access to drying chambers, hot gas inlet chambers and ductwork; installation and maintenance. →