Combi exhaust vent yellowing

Robbi · December 21

Hi. My combi boiler exhaust vent is beginning to develop yellowish orange streaks on the seams of the vent pipes. Attaining a proper pitch is impossible in my home due to layout etc. Would a 90 degree elbow help with the ventilation? Thank you all!

hot_rod · December 21

Probably leaking at that transition coupling? If that is the proper coupling there must be a seal inside?

Nice sheetrock access :)

Robbi · December 21

https://forum.heatinghelp.com/discussion/comment/1828452#Comment_1828452

Definitely the proper coupling - the inner seal looked fine. I'm thinking turbulent zone in that area and some of the exhaust is condensing onto inner ridges inside that portion in photo, and leaking downward. Just unsure how to solve - thinking introducing elbow with non corrugulaed inside

Lol sheet rock - it was like that when I started doing my thing

Derheatmeister · December 22

Is this the flexible Centrotherm venting system?

Robbi · December 22

https://forum.heatinghelp.com/discussion/comment/1828512#Comment_1828512

Yes - duravent from supplyhouse

pedmec · December 22

That yellowing is probably the lubricate changing color. Could be from heat, absorbing moisture, or aging

GGross · December 23

When used for a flue the flex is not supposed to run at greater than a 45 degree angle ever. that's probably not what is causing the yellow, but somewhere in there you are probably trapping condensate as it can't run back to the boiler at that angle and will get trapped in the pipe

Robbi · December 24

https://forum.heatinghelp.com/discussion/comment/1828980#Comment_1828980

I'll change it to a 45 degree and gradually work towards a gentler curve. The installation area is impossible to get the proper pitch to drain back to the boiler. Thanks for looking out

Combi exhaust vent yellowing

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