Furnace flue

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1

Originally Posted By: kmilton
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Rust or what? ]

2

Originally Posted By: tmantsch
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If the vent ran along the exterior, that would be the culprit.


Assuming it is a B-vent and vent ran out through the roof, check...

- for additional rust in the attic below the roofline.
- water entry as vent penetrates the roof on top.
- vent connection at screw holes (could H2O penetrate?)...

However, being that the rust appears closer to the furnace, I would venture that the vent connector is too big for the furnance (tempting the exhaust gas to loiter) causing condensation...that leads to rust lower in the vent.

Definately recommend repair.
I hear breathing the byproducts of combustion is a bad habit for humans...

3

Originally Posted By: bkelly2
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Problems with combustion. Reccomend evaluation by liscensed HVAC technician with remedy as necessary.


BK

4

Originally Posted By: kmilton
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Thank you for your help.


Ken

5

Originally Posted By: jrupert
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This is the draft diverter box on the furnace, it is normally just painted heavy gauge sheet metal, flue gases have a high level of moisture and over 20 yrs + they will rust, this is normal. if this is a newer furnace under 20yrs (natural draft) poor combustion can also cause this.

6

Originally Posted By: jkormos
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CO can also have a corrosive effect on metal surfaces