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Old 11-03-2011, 08:50 AM   #1
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Flue Question for a Boiler and Furnace


I have both a furnace and a boiler both are 75 - 80% efficient, I have the flues tied together with there recommended flue size feeding into a 6 inch pipe that goes out the wall to an old multi-wall flue pie. My question is can I connect to the multi wall buy inserting a 6 inch diamiter pipe up into the the existing 8 and does that connection have to be fitted tight or sealed?

would it be a problem if the bottom of the 8 acted as a draft?

I need to replace the pipe and I want to just push up 6 into the 8 with an elbow or depending on the pysical space available a "T" connection.

Any thoughts?

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Old 11-03-2011, 06:58 PM   #2
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Flue Question for a Boiler and Furnace


I would use a 6x8 increaser for a proper fit.....I would also make sure flue pipes are all sized properly and that boiler and furnace have saftys against clogged flue pipes??????? ben

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Old 11-04-2011, 06:30 AM   #3
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Flue Question for a Boiler and Furnace


Need more info and pictures sounds a little confusing.
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Old 11-04-2011, 07:47 AM   #4
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Flue Question for a Boiler and Furnace


Sorry for the confusion.

the furnace flue has a 3 inch x 15foot length of pipe. this goes to a 3 to 4 inch adapter, then a 4 to 6 adapter then connects to a 6inch tee. This is where the boiler connects with it's 4inch flue pipe and 4 to 6 adapter.

The 6 inch tee then connects to a 6inch by 3 ft pipe that exits through the cement wall. on the other side of the wall the pipe has a 6inch elbow.

This is where I have the problem on inspection yesterday I discovered the pipe (90 degree elbow) is rusted and not connected to the vertical flue pipe properly.

The flue pipe outside is very old it has a 12 outer liner with an 8 inch central galvanized flue pipe. I do not know the mfg of the flue.

At this point I know I need a 6 to 8 adapter to sit on top of the elbow. I asked in my original question if I could just slide down a 6inch x 12inch inside the 8 which would leave an opening and now I know that would be wrong.

So I am attaching a picture of the existing 8"flue and if anyone know the mfg I could then get the proper connector to connect and reduce to 6 inch.

My other issue is the original owner left the remainder of an old brick chimney in the way only inches below the elbow or I would use a tee to divert any moisture and or debris.

So here are the pics, do you recognize this pipe?
Attached Thumbnails
Flue Question for a Boiler and Furnace-11.03.11-022.jpg   Flue Question for a Boiler and Furnace-11.03.11-008.jpg   Flue Question for a Boiler and Furnace-11.03.11-019.jpg   Flue Question for a Boiler and Furnace-11.03.11-018.jpg  
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Old 11-04-2011, 09:02 AM   #5
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Flue Question for a Boiler and Furnace


Can't you just replace the rusted ell and install a storm collar and rain cap on top of the pipe to keep the water out. Make sure that whole thing is away from any wood it looks pretty close.
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Old 11-04-2011, 09:22 AM   #6
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Flue Question for a Boiler and Furnace


I'm getting ready to leave now for an emergency repair to it. The pipe is so old I don't think I will be able to find the mfg replacement parts even if I can find a label/stamp.

For now I will replace with a standard 6 to 8 adapter a galvanized 6inch elbow and any other pipe that shows signs of rust.

But if any one dose know whos' pipe this is it would be great to know. I sure I will be replacing the entire vertical section with new in the future, I just want to make it safe now.

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