Subjgrp 206. Ventilation
- § 57.22201 - Mechanical ventilation (I-A, I-B, I-C, II-A, II-B, III, IV, V-A, and V-B mines).
- § 57.22202 - Main fans (I-A, I-B, I-C, II-A, III, V-A, and V-B mines).
- § 57.22203 - Main fan operation (I-C mines).
- § 57.22204 - Main fan operation and inspection (I-A, II-A, III, and V-A mines).
- § 57.22205 - Doors on main fans (I-A, II-A, III, and V-A mines).
- § 57.22206 - Main ventilation failure (I-A, II-A, III, and V-A mines).
- § 57.22207 - Booster fans (I-A, II-A, III, and V-A mines).
- § 57.22208 - Auxiliary fans (I-A, II-A, III, and V-A mines).
- § 57.22209 - Auxiliary fans (I-C mines).
- § 57.22210 - In-line filters (I-C mines).
- § 57.22211 - Air flow (I-A mines).
- § 57.22212 - Air flow (I-C, II-A, and V-A mines).
- § 57.22213 - Air flow (III mines).
- § 57.22214 - Changes in ventilation (I-A, II-A, III, and V-A mines).
- § 57.22215 - Separation of intake and return air (I-A, II-A, III, and V-A mines).
- § 57.22216 - Separation of intake and return air (I-C mines).
- § 57.22217 - Seals and stoppings (I-A, I-B, and I-C mines).
- § 57.22218 - Seals and stoppings (III, V-A, and V-B mines).
- § 57.22219 - Seals and stoppings (II-A mines).
- § 57.22220 - Air passing unsealed areas (I-A, II-A, III, and V-A mines).
- § 57.22221 - Overcast and undercast construction (I-A, II-A, III, and V-A mines).
- § 57.22222 - Ventilation materials (I-A, I-B, I-C, II-A, III, V-A, and V-B mines).
- § 57.22223 - Crosscuts before abandonment (III mines).
- § 57.22224 - Auxiliary equipment stations (I-A and III mines).
- § 57.22225 - Auxiliary equipment stations (I-C mines).
- § 57.22226 - Testing for methane (IV mines).
- § 57.22227 - Approved testing devices (I-A, I-B, I-C, II-A, II-B, III, IV, V-A, and V-B mines).
- § 57.22228 - Preshift examination (I-A, I-C, II-A, III, and V-A mines).
- § 57.22229 - Weekly testing (I-A, III, and V-A mines).
- § 57.22230 - Weekly testing (II-A mines).
- § 57.22231 - Actions at 0.25 percent methane (I-B, II-B, V-B, and VI mines).
- § 57.22232 - Actions at 0.5 percent methane (I-B, II-A, II-B, IV, V-B, and VI mines).
- § 57.22233 - Actions at 0.5 percent methane (I-C mines).
- § 57.22234 - Actions at 1.0 percent methane (I-A, I-B, III, V-A, and V-B mines).
- § 57.22235 - Actions at 1.0 percent methane (I-C, II-A, II-B, and IV mines).
- § 57.22236 - Actions at 1.0 percent methane (VI mines).
- § 57.22237 - Actions at 2.0 to 2.5 percent methane in bleeder systems (I-A and III mines).
- § 57.22238 - Actions at 2.0 percent methane (I-B, II-B, V-B, and VI mines).
- § 57.22239 - Actions at 2.0 percent methane (IV mines).
- § 57.22240 - Actions at 2.0 percent methane (V-A mines).
- § 57.22241 - Advance face boreholes (I-C mines).