Ductwork Labeling Requirements
Duct systems may require labeling for identification, flow direction, or hazard warning.
What You Might Be Looking At
ductwork with labels, tags, or painted arrows indicating system type or flow direction
Apprentice words: duct label, pipe marking, duct tag, flow arrow
Trade terms: duct label, duct marker, flow direction arrow, system identification
Check First
What Not To Do
Don't skip duct labeling. Don't use wrong colors or symbols. Don't assume labeling is optional.
What can go wrong: Inspector rejection, maintenance confusion, safety issues during future work, code violation
Better Foreman Question
For this duct system, what labeling, color coding, and flow arrows does the spec require?
Verify With
Reference type: project specs, ASME A13.1
Source to verify: ASME A13.1 Scheme for Identification of Piping Systems, project specification
Safe wording: Duct labeling requirements vary by project.