#11  
Old 07-28-2008, 06:33 PM
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Default Re: How to minimize smoke on Facade

Oven is 36 inches. Dome height 18-19 inches. Door is 12 x 19 .


You're right about the distance from the entry door to the outside facade is probably about 10".
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  #12  
Old 07-29-2008, 11:11 AM
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Default Re: How to minimize smoke on Facade

If you make a screen to shield off the top of your outer arch (entrance), which you can put in (like a kind of "door") during firing up it will probably force the smoke out the chimney.

karl
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  #13  
Old 07-29-2008, 11:36 AM
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Default Re: How to minimize smoke on Facade

Yes, I agree with Karl. Before you start modifying your entry, make up a draft door to tilt from oven opening to flue back. This will get you more air in the fire and channel smoke up the chimney.

Here's Jim's excellent draft door. note the air inlet at the bottom, and the tilt forward to the front of the flue:



You have quite a tall chimney. You shouldn't be having these problems unless there is an actual chimney obstruction. No dead critters up there?
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  #14  
Old 07-29-2008, 07:09 PM
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Default Re: How to minimize smoke on Facade

No critters.

The only thing I can think of is the comment made re the depth of the vent landing. I have the flue sitting on 2 half bricks at either end of the landing so the opening into the flue is smaller than the flue itself.

As I am starting to build another here at my home I want to make sure I make this one better. I have seen many designs out there and find that I am never quite sure how to do that landing part until the time comes and I look to see what fits and perhaps this time I should do some planning ahead.

So if the vent landing should be 15-20 inches, I should set the oven opening back say 20 inches and if you count for the facade which let's say is a brick, then you probably need to set it back 24 inches or so. Is this correct? I did not see specific dimensions set forth in the online instructions. Or is the entire landing from the entry bricks to the facade 20 inches" Seems wide. If you had a 4 inch brick on the facade, your opening would be 16 inches wide from the back of the facade to the entry bricks.

Thx
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Old 07-29-2008, 07:44 PM
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Default Re: How to minimize smoke on Facade

I pulled that 15-20 inch number out of my head. I don't think I have seen a recommended lenght for the landing but if you look at the construction photos it looks like most builders are using 1 2/3 bricks ( about 15 inches assuming "standard" firebrick) and then a 2 to 4 inch decrative arch. I found the discussion I had seen before here.

http://www.fornobravo.com/forum/f8/s...size-2711.html (Smoke past door / Throat Size?)

This builder built a 50 inch monster. He fixed the smoke problem by extending the landing. It's a nice looking fix and seemed to have solved the problem. You should check out the photos and consider a fix like this if you do not want to build a new oven.

Bruce
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Old 07-29-2008, 07:48 PM
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Default Re: How to minimize smoke on Facade

Here is another problem oven and a fix.

http://www.fornobravo.com/forum/f21/...moke-1523.html (Cowl deflects smoke)


I think the pictures on this one demonstate the problem quite well. The fix is not as nice but it seemed to work.


Bruce
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  #17  
Old 07-29-2008, 08:36 PM
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Default Re: How to minimize smoke on Facade

Quote:
Originally Posted by tdibratt View Post
I have the flue sitting on 2 half bricks at either end of the landing so the opening into the flue is smaller than the flue itself.
I think this may be the problem. My oven, 2 fires, seems to be doing well. I am going to add another 12 inches to the height and drop the decorative brick down one inch on the front arch - someone else mentioned that and it seemed to solve the problem. My flue is 8 x 19; here are a few pics to show you the depth. Hope this helps.

Les...
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How to minimize smoke on Facade-les-oven-012.jpg   How to minimize smoke on Facade-les-oven-015.jpg   How to minimize smoke on Facade-les-oven-016.jpg  
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Old 07-31-2008, 06:05 PM
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Default Re: How to minimize smoke on Facade

I think a cast or metal vent instead of the typical arch is the best way to keep smoke off the facade.

My cast vent broke when I removed it from the form, but it makes a nice cutaway view. Smoke exiting the mouth of the oven does not really have any chance to roll out the front. I feel this is often overlooked when current builders use the arch design. Note that I put a fake arch on the front of the oven to keep the arch look...

Drake
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How to minimize smoke on Facade-dsc_76.jpg   How to minimize smoke on Facade-dsc_91.jpg   How to minimize smoke on Facade-dsc_102.jpg   How to minimize smoke on Facade-ovenfinal.jpg  
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  #19  
Old 07-31-2008, 08:31 PM
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Default Re: How to minimize smoke on Facade

If I could do it all over, I would copy Drake's vent. Looks like it should draw extremely well - can't imagine any smoke escaping the entry. At the time, I was unsure of using a castable and didn't want any potential "do overs".
Yet another idea I will "steal" if I ever build another. In fact, I may copy the entire design...I love the brick/stone look.

RT
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  #20  
Old 08-01-2008, 03:40 AM
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Default Re: How to minimize smoke on Facade

Drake, very nice oven facade. Those pieces on the outside framing the entrance, are they precast stuff? What about the sill? Where do you get those? Also, I cannot tell do you have an inner lip to close the door up against?

Thx
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