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-   -   Is a flue liner necessary? (http://www.fornobravo.com/forum/f9/flue-liner-necessary-16070.html)

md_massimino 06-07-2011 07:58 AM

Is a flue liner necessary?
 
I understand the role a flue liner plays in a residential fireplace chimney, but is it really necessary in an outdoor setting? I was thinking of just building a double wall chimney and capping it on the top with a piece of slate. Any advice?

dmun 06-07-2011 01:04 PM

Re: Is a flue liner necessary?
 
That will work fine, it's just that a couple of lengths of 8" flue tile are MUCH cheaper than what you could build with firebrick.

brickie in oz 06-07-2011 01:08 PM

Re: Is a flue liner necessary?
 
Quote:

Originally Posted by dmun (Post 114481)
That will work fine, it's just that a couple of lengths of 8" flue tile are MUCH cheaper than what you could build with firebrick.

You dont need firebricks for a chimney, most chimneys are built using normal bricks.

Tscarborough 06-07-2011 05:40 PM

Re: Is a flue liner necessary?
 
You do not need firebrick, but if you are going by code, you need flue liner. It is faster and cheaper to use flue than to build a double wall chimney, anyway. For my BBQ pit chimney, I just built single wythe brick, but the heat going up an oven flue is much higher, plus all the joints will make creosote buildup an issue.

Les 06-07-2011 10:06 PM

Re: Is a flue liner necessary?
 
Md's question had nothing to do with the type of brick - just a way to get it done. Dude, your approach to the vent will work. I would go with Davids suggestion of using a clay liner. They are inexpensive and readily available - worked for me.

brickie in oz 06-07-2011 11:28 PM

Re: Is a flue liner necessary?
 
Quote:

Originally Posted by Les (Post 114530)
Md's question had nothing to with brick..

:confused: So now everyone has more knowledge. :)

md_massimino 06-09-2011 01:37 PM

Re: Is a flue liner necessary?
 
OK, I'll stop bucking the system now ;) Clay flue liner it is.

Cheesesteak 06-16-2011 12:19 PM

Re: Is a flue liner necessary?
 
Quote:

Originally Posted by dmun (Post 114481)
That will work fine, it's just that a couple of lengths of 8" flue tile are MUCH cheaper than what you could build with firebrick.

Okay - I cannot get 8x8 square clay flue tile in may area. There's only 8" round clay flue tile - and the next smallest is 8x13 oval.

The 8" round is outside diameter - giving me an inside diameter of around 6".

Is that going to work?

I'd note that the 8" square clay flue liners from Superior are also outside dimensions . . .

thanks -
Dan

Tscarborough 06-18-2011 09:09 AM

Re: Is a flue liner necessary?
 
Round is better, 8" round should be fine. The (very rough) rule of thumb is 10% of the opening is the size flue required. Bigger is generally better, espcially with square or rectangular flues. So if you have an 18"wX16"H opening (288 SqIn), then a flue in the neighborhood of 28-30 SqIn is good. A 6" flue gives you 28.27 SqIn, so it should work just fine.

Cheesesteak 06-19-2011 05:27 PM

Re: Is a flue liner necessary?
 
Quote:

Originally Posted by Tscarborough (Post 115248)
Round is better, 8" round should be fine. The (very rough) rule of thumb is 10% of the opening is the size flue required. Bigger is generally better, espcially with square or rectangular flues. So if you have an 18"wX16"H opening (288 SqIn), then a flue in the neighborhood of 28-30 SqIn is good. A 6" flue gives you 28.27 SqIn, so it should work just fine.

My entry arch is 12" high, 19" wide. Here it is:

http://farm3.static.flickr.com/2352/...af3e3a40e8.jpg

I figure I've got a 2.5" x 19" rectangle at the bottom of the arch, or 47.5 sq.in. and roughly 1/2 of a 9.5" radius circle, or 283.5 sq.in. / 2 = 141.75 sq.in. Total = 47.5 + 141.75 = 189.25 sq.in. opening in my entry arch. My 6" inside dia. clay flue is 28.27 sq.in which gives me a flue of approximately 15% of my oven opening. Sounds like that's more than sufficient . . .

Time to press on.


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