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Old 11-26-2008, 07:13 PM   #1
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Condensation From Exhaust Pipe


I just finished installing a Big Max 45000 btu propane heater in my garage. It has a 3" vertical exhaust stack with double wall piping through the interior ceiling and a single wall through the roof. I have condenstion running out of the exhaust where it connects to the furnace at the back of the unit. It is not a water leak from the roof, it is moisture running down the inside of the exhaust stack, some days it is not there since the humidity is lower. What can I do to stop this or is there some sort of drain tube that can be put at the base of the elbow that goes into the back of the furnace? Thanks for any help with this.

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Old 11-26-2008, 07:30 PM   #2
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Condensation From Exhaust Pipe


You can pull the single wall, and install double wall vent through the roof.
Not suppose to use single wall in unconditioned areas. And in the attic, and outside the roof are both unconditioned areas.

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Old 11-28-2008, 05:49 PM   #3
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Condensation From Exhaust Pipe


Thanks for the reply, but I guess the question now becomes why the manufacturer of the furnace and exhaust kit do it the way they do. Their kit is for the vertical exhaust and I installed per their instructions and sounds as though they should have put 2 double sections of pipe inthe kit instead of the 1 piece for going through the interior ceiling and a single that goes through the exterior. So I should pull the single out and buy another double wall and that will stop the condensation problem? Again thanks for the help, just want to get this right and more importantly, safe.
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Old 11-28-2008, 06:43 PM   #4
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Condensation From Exhaust Pipe


That should take care of it.

Never seen instructions that showed a single wall to penetragte the roof.
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Old 11-29-2008, 07:39 AM   #5
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Condensation From Exhaust Pipe


If this is AL20-4C there are many I&O manuals in a vertical application. Even with offsets in the unconditioned attic. Most if not all of them talk about a condensate tee for condensate.
Is this pipe a stainless steel pipe?
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Old 11-29-2008, 11:04 AM   #6
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Condensation From Exhaust Pipe


It appears to be just your standard galvanized pieces that came with the kit. As for the t-kit, they show a t piece that should be installed with the horizontal kit with a copper line that is looped as a trap. As I said above, I am surprised that the kit would come with the single wall unit to be installed above the double unit if it should indeed be double wall throughout. Again thanks for the replies. I will get this resolved.
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Old 11-30-2008, 04:04 PM   #7
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Condensation From Exhaust Pipe


I would check the I&O manual too see if it should be Stainless. If there is a condensate trap it should be stainless as regular vent pipe will not last long with any moisture in it. The moisture holds carbonic, sulfuric and hydrochloric acids.

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