#1  
Old 12-04-2009, 09:22 AM
Serf
 
Join Date: Oct 2009
Location: Allentown PA
Posts: 15
Default Chimney dilemma w/ Duratech

I'm working with a Duratech double wall system (pretty, but expensive). I have terminated my arch/opening with four bricks, as shown in photos. I have a Duratech anchor plate ready to install, but in spite of the fact that Duratech's instructions call for setting it directly on top of the bricks with a high-temp sealant, the anchor plate's metal seems pretty thin to take that much heat directly. Also, in spite of the Dt illustration showing the anchor plate, with its round opening, installed on a square chimney/stove top, I'm wondering about the exposed underside around the corners where I have put a round peg in a square hole, so to speak. I had considered making up an 11" square 3/16" steel plate with a 6" diameter hole that would attach to the top of the brick, that I would then attach the anchor plate to. I was also thinking of adding about a foot of 6" ID refractory flue liner above the bricks and putting the anchor plate on top of that (which would also save me a few bucks). A stove place told me it tends to crack. Any thoughts?
There also seems to be some confusion about the height of the chimney above the roof. The FB instructions (p 45) call for 2" (inches) above any roof within 10' (feet), but the Duratech instructions call for 2' (feet) which seems more likely. Is this a misprint in the FB manual?
There also seems to be some discrepancy in ID's between 8" and 6" (which is what I'm using). FB says 6" for a 36" oven, but also says 8" in some places.
Attached Thumbnails
Chimney dilemma w/ Duratech-pc032045.jpg   Chimney dilemma w/ Duratech-pc032046.jpg  
Reply With Quote
  #2  
Old 12-04-2009, 09:56 AM
james's Avatar
Brick Oven Merchant
 
Join Date: Mar 2005
Location: Pebble Beach, CA
Posts: 4,648
Default Re: Chimney dilemma w/ Duratech

Hi Spazio,

I will comb through the manual for typo's. As you note -- the instructions are for 2' (24") above anything combustible within 10'. The best thing would be to use the Duratech installation guide. I am attaching the pdf.

The 6" pipe is correct for the 36" oven, and 8" for the 42" oven.

James
Attached Files
File Type: pdf Duravent.pdf (1.02 MB, 332 views)
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #3  
Old 12-04-2009, 11:31 AM
Serf
 
Join Date: Oct 2009
Location: Allentown PA
Posts: 15
Default Re: Chimney dilemma w/ Duratech

Thanks Jim, and let me know what you find.
I'm ciphering this all out, and I think I'll JUST squeak by with my clearances and distances. I've got a good remote reading thermometer, but what kind of temperature do you think I'll find at the top of a 5' or so straight Duratech stack? We'll be doing pizza, so I guess we'll be looking at 600 degrees or so inside; does that sound about right?
Mike
Reply With Quote
  #4  
Old 12-06-2009, 12:32 AM
lwalper's Avatar
Laborer
 
Join Date: Dec 2009
Location: Tennessee
Posts: 69
Default Re: Chimney dilemma w/ Duratech

Duravent makes a good insulated flue -- pretty much what goes in is what comes out, especially on such a short run of pipe and an open system with good draft like these ovens have. I'm sure there's probably quite a bit of dilution with what air comes in through the door and goes directly up the vent so that may drop the temperature quite a bit at the top, but it's still HOT. Watch those clearances!

Actually I think most guidlines for chimney construction are designed to develop a good draft and prevent downdrafts that will puff smoke out the door in your face. What I've typically seen is two feet above anything within three feet - so ... depending on the pitch of your roof you may need to have a little taller chimney than the guy next door with a lower pitch on the roof.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Chimney options Yahoo-Archive Design Styles, Chimneys and Finish 3 10-01-2010 10:18 AM
Shape of a brick chimney Jochen Design Styles, Chimneys and Finish 2 06-13-2010 04:16 AM
Duratech chimney exterior feels hotter than it should... sjmeff Design Styles, Chimneys and Finish 16 09-22-2009 02:33 PM
Chimney transition Wiley Design Styles, Chimneys and Finish 5 05-20-2008 09:25 PM
Flue Chimney Tips Alf Design Styles, Chimneys and Finish 1 08-02-2005 07:07 AM


All times are GMT -7. The time now is 12:36 PM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
2006/10 Forno Bravo, LLC