TinnerFlow™4th YearSpecialty ExhaustRED · Stop / Verify
Do not connect standard galvanized duct to unknown corrosive exhaust. Stop and verify the lab exhaust material spec, chemical service, joint method, and submittal before installing.
Laboratory and chemical exhaust is material-specific. Standard galvanized duct may be completely wrong if the hood handles corrosive vapors, solvents, acids, or specialty exhaust streams.
The correct material could be stainless, coated duct, plastic/composite, welded construction, gasketed specialty duct, or another engineered system depending on the chemicals and project specs. The apprentice move is to stop, confirm the tag/system, and match the approved material/submittal.
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.