['Specialized Industries']

['Mining']

07/19/2025

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§57.22211 Air flow (I-A mines).

...

§57.22211 Air flow (I-A mines).

RegSense CFR Regulations Mining Specialized Industries CFR Section English Focus Area USA

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.

['Specialized Industries']

['Mining']

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