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  #1  
Old 10/30/09, 11:08 PM
Michael J. Merino's Avatar
Michael J. Merino Michael J. Merino is offline
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Default HVAC Duct Issue

This is an inspection on a short sale house. The house has some moisture issues, with mold on the walls and carpet. The HVAC duct has this white substance on it. I am not sure if it was manufactured this way or if it is the result of the moisture. It seems to be consistent on all the visible duct work, but, some of the elbows are smooth and shiny with a little bit of the white on it.
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  #2  
Old 10/30/09, 11:14 PM
Mark Nahrgang, C.R.I.'s Avatar
Mark Nahrgang, C.R.I. Mark Nahrgang, C.R.I. is offline
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Default Re: HVAC Duct Issue

I'm not sure, but I think it's galvanized.



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  #3  
Old 10/30/09, 11:18 PM
Michael J. Merino's Avatar
Michael J. Merino Michael J. Merino is offline
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Default Re: HVAC Duct Issue

Quote:
Originally Posted by mnahrgang View Post
I'm not sure, but I think it's galvanized.
That is what I am thinking, but the smooth shiny sections and the moisture issue has me wondering. I was not able to rub it off with my finger nail and it feels rough.



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  #4  
Old 10/30/09, 11:22 PM
Mark Nahrgang, C.R.I.'s Avatar
Mark Nahrgang, C.R.I. Mark Nahrgang, C.R.I. is offline
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Default Re: HVAC Duct Issue

The smooth sections might be stainless...

The moisture wouldn't likely cause mold to grow on metal. Mold grows on organics, and if there was any dust on the ducts for it to grow on, you could wipe it off.



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  #5  
Old 10/30/09, 11:34 PM
Michael J. Merino's Avatar
Michael J. Merino Michael J. Merino is offline
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Default Re: HVAC Duct Issue

Thanks Mark, you have been a great help.



Michael Merino
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  #6  
Old 10/31/09, 11:31 AM
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James A. Levy James A. Levy is offline
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Default Re: HVAC Duct Issue

Without a doubt Mike, that is in the galvanized plating. No worries mate!
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  #7  
Old 10/31/09, 1:50 PM
David A. Andersen, TN HI# 40's Avatar
David A. Andersen, TN HI# 40 David A. Andersen, TN HI# 40 is offline
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Default Re: HVAC Duct Issue

Do a ph test on the white stuff and check the sheetrock.



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  #8  
Old 11/2/09, 7:02 PM
Brad G. Knowlton Brad G. Knowlton is offline
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Default Re: HVAC Duct Issue

That is oxidized zinc from the galvanized sheet metal. This happens if they leave the sheet metal stacked with moisture between sheets before it is formed into ducts. I have refused many shipments of sheet metal for this very reason. It is only a cosmetic problem as far as I can tell, but many customers balk when they see it.
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  #9  
Old 11/2/09, 10:00 PM
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Brian E. Kelly Brian E. Kelly is offline
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Default Re: HVAC Duct Issue

Quote:
Originally Posted by bknowlton View Post
That is oxidized zinc from the galvanized sheet metal. This happens if they leave the sheet metal stacked with moisture between sheets before it is formed into ducts. I have refused many shipments of sheet metal for this very reason. It is only a cosmetic problem as far as I can tell, but many customers balk when they see it.
Great explanation. I did not know that.



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  #10  
Old 11/6/09, 11:48 PM
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Robert Sole, CMI Robert Sole, CMI is offline
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Default Re: HVAC Duct Issue

In the steel industry we called it white rust. As was said, it is an oxidation of the zinc coating.



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