netneut
finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing


Finishing.com has been free for 22 years,
but without net neutrality we could soon
cease to exist. Do us a solid, click on
the banner, and contact congress today!
HomeFAQsBooksHelpWantedAdvertiseForum
topic 9946

GALVANIZED OR GALVANNEALED DUCTWORK


(2001)

I am a consulting engineer looking to specify material for a ductwork system that will be run exposed up the side of a building & painted with an epoxy paint.

My questions are:

1. Should the ductwork be galvanized? galvannealed?

2. Is there a special primer that needs to be used for either of the above?

3. What is the cost difference between galvanized & galvannealed sheet metal. (26 ga. w/ G90 coating)

Jason May
ENGINEERS - Princeton, New Jersey


(2001)

Jason, have you considered fabricating the duckwork out of prepainted coil stock? This would avoid the need to prepare the ducts for painting in the field.

Roy Nuss
Trevose, Pennsylvania, USA


June , 2008

Hi, Jason. Galvanneal is very similar to galvanizing except it receives an annealing process to make it more appropriate as a paintable surface. So galvanneal would be better than galvanized. A primer designed for galvanneal is a good idea. I don't have cost figures but the additional cost of galvanneal must be small.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.