StacksVerified U.S. regulatory reference

30 CFR §77.302

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Thermal dryer systems shall include a bypass stack, relief stack or individual discharge stack provided with automatic venting which will permit gases from the dryer heating unit to bypass the heating chamber and vent to the outside atmosphere during any shutdown operation.