30 CFR 57.22211 - Air flow (I-A mines).

Regulations last checked for updates: Feb 10, 2026

Title 30 - Mineral Resources last revised: Jan 27, 2026

View all text of Subpart T [§ 57.22001 - § 57.22608]

§ 57.22211 - Air flow (I-A mines).

The average air velocity in the last open crosscut in pairs or sets of developing entries, or through other ventilation openings nearest the face, shall be at least 40 feet per minute. The velocity of air ventilating each face at a work place shall be at least 20 feet per minute.

authority: 30 U.S.C. 811.

source: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.

cite as: 30 CFR 57.22211