Static field route #18926

What do I do if galvanized duct is being connected to a corrosive lab fume hood?

Grease Duct, Kitchen Exhaust & Industrial Exhaust🟥 STOP / VERIFYV189 answer-gap expansion

📖 Verified core answer

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.

Open in Field Rescue Open category

Field verification checklist

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.

Ask foreman

This hood appears to be corrosive/specialty exhaust and the duct staged here is galvanized. I checked the tag and spec callout. Do you want us to stop and verify the approved material/submittal before connecting?

Text to foreman

Route options

AMake the field correction only if it is within your assignment and the approved method.

BHold and document the condition if the fix affects airflow, access, life safety, pressure class, rated assemblies, equipment, or another trade.

CBring the foreman/detailer the location, what you checked, and what decision you need before cover, startup, or rework.

Do not do this

Do not substitute galvanized duct on chemical/lab exhaust because it physically fits.

Why this matters

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

Verification basis

Approved drawings/specs, project coordination drawings, manufacturer instructions/submittals, shop standards, foreman/detailer direction, employer policy, and AHJ/code requirements.