“Stack” means any chimney, flue, or duct arranged to discharge an emission to the ambient air.

Source. #1717, eff 2-19-81; ss by #2332, eff 4-29-83; ss by #2938, eff 12-27-84; ss and moved by #5033, eff 12-27-90 (see Env-A 101.86) New. #5033, eff 12-27-90 (from Env-A 101.84); ss and moved by #6057-A, eff 6-30-95 (from Env-A 101.85); renumbered by #8256 (from Env-A 101.256), (see Revision Note #1 at chapter heading); renumbered by #8304 (see Revision Note #2 at chapter heading); renumbered by #9839 (from Env-A 101.177), (see Revision Note #3 at chapter heading); ss by #13105, eff 9-25-20 (formerly Env-A 101.179) (see Revision Note #4 at chapter heading for Env-A 100)