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briot 08-24-2009 06:33 PM

flue and vent opening
I'm trying to draw up plans for our oven I know this is a dumb question, but is the flue different than the vent opening between the two arches? If it is, how do they come together, how do they transition?

Mitchamus 08-24-2009 09:04 PM

Re: flue and vent opening
the easiest way to explain it is - have a look at the vent & chimney gallery...

there are some great pics in there that should explain everything...

The flue sits on top of the vent, they're not really the same thing.

On this site - a chimney and flue are talked about as the same thing, but a flue (by definition) is the area inside a chimney.

so to some up:
Vent - the hole in the oven where the smoke comes out
Flue - the passage created by the chimney that's moves the smoke away

In the following pics, the stainless tube is the flue (chimney).

this shows the vent:

This shows the 'vent transition'

This shows the flue (chimney) ready to be mortared

And this shows the flue (chimney) in place

Thanks go to RodneyF for the example pics - great job.

briot 08-24-2009 10:38 PM

Re: flue and vent opening
Thanks, that helps a lot.

Annie Baker 07-26-2010 06:49 AM

Re: flue and vent opening
Thank you VERY much for the explanations; I was very confused and now I feel more confident to go about building the front of my oven.

leckig 08-02-2010 01:43 PM

Re: flue and vent opening
how do you seal the gap between the metal flue and the bricks? Just a regular high temp mortar or something else?

Mitchamus 08-02-2010 03:12 PM

Re: flue and vent opening
the short answer (and in the example above) - Yes. (with brick work and mortar)

the long answer is - it depends upon what chimney you have purchased - some chimneys come with a 'base plate' (or adapter) which can be bolted to the vent transition using dyna-bolts or "Tap Cons" I think they are called in the US - either way they are masonry anchors.

you can see this in the pic below:

leckig 08-02-2010 03:44 PM

Re: flue and vent opening
Thanks but I should be more specific with my question, I posted it here:

Tscarborough 08-02-2010 06:08 PM

Re: flue and vent opening
I would mortar in firebrick around the flue with refractory cement at least one course, then give it a good coating all over.

leckig 08-03-2010 07:05 AM

Re: flue and vent opening
thanks! Good coating of what - the cement?

After much consideration I think I will scratch the idea of igloo finish and do the home enclosure, so I dont need to worry about the look of the flue, just need to make sure it stays where it should :)

Dino_Pizza 08-03-2010 08:48 AM

Re: flue and vent opening
Here's a pic of how I did mine:

And a shot of the finished product from underneath, before I put the mortar in the 8" circle area at the top:

And this my picassa link to about 8 pictures of how I did my vent.
Picasa Web Albums - Dino - vent trans

I did not use any screws for the anchor plate, but just mortared in that "L" shaped brick I cut to hold it in. I also saw no need for any insulation material between the plate and bricks. I kinda like this taller "transition" that angles the smoke up as it narrows. It draws really well. I would think you can do a similar transition to a clay pipe if you went that rout.

There are lots of good ways to do this and having a thread that shows people the various methods we did it is great. This transition (well the idea of, and how to go about it) was the toughest part of the build. So lots of pictures help:D


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