MSHA - Code of Federal Regulations - 30 CFR 77.303
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MSHA - Title 30 CFR
30 CFR § 77.303
Hot gas inlet chamber dropout doors.

Thermal dryer systems which employ a hot gas inlet chamber shall be equipped with drop-out doors at the bottom of the inlet chamber or with other effective means which permit coal, fly-ash, or other heated material to fall from the chamber.