What do I do if galvanized duct is being connected to a corrosive lab fume hood?
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.
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?
Watch out
Do not substitute galvanized duct on chemical/lab exhaust because it physically fits.
Check
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.
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.
Say this to your 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?