Can galvanized duct be used on lab fume hood exhaust?

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.']

Stop if

• 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.

Check

• Wrong material on corrosive exhaust can fail fast, leak hazardous air, damage the system, and create serious safety/liability problems.

Steps

• Confirm the hood/system tag and what exhaust service it is: general, corrosive, solvent, acid, bio, or specialty.
• Check duct material on the approved drawings, specs, and submittals.
• Look for delivered specialty material and compare labels/heat numbers/coatings if required.
• Verify joint/seal/weld method before connecting anything.
• Protect already-installed wrong material from being buried as if complete.

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