StacksVerified U.S. regulatory reference

30 CFR §77.303

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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.