#11  
Old 03-30-2010, 10:21 AM
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Default Re: Flue w/sonotubes as forms?

Okay, so now i start to see, it vents from the front of the oven chamber, and has a ninety degree redirect to the back. I'm just scratching my head over this one. This is what Lord Grimthorpe once referred to as "the strange propensity of mankind for taking more trouble to do wrong than it would be to do right"
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  #12  
Old 03-30-2010, 10:29 AM
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Default Re: Flue w/sonotubes as forms?

Apparently to get it away from the eaves. It can't draw well, though.
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Old 03-30-2010, 11:26 AM
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Default Re: Flue w/sonotubes as forms?

This particular build was done by a fellow named Doug.here is a link to his build. I think he knows what his doing as I think that the oven came out looking very nice.I like the fact that as long as you follow the basic principals of building oven chamber the rest can be left up to your imagination.Here is a picture of the completed oven... ..Marian & Doug's Pizza Oven
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Old 03-30-2010, 03:06 PM
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Default Re: Flue w/sonotubes as forms?

It's a perfectly good looking enclosure, but the two ninety degree bends in the flue are a real problem. Chimney code calls for no more than two angles, no more than thirty degrees. It's a barrel vault, so obviously they are interested in retained heat cooking for large amounts of bread, but they have this big uninsulated place in the middle of their dome. Also, having the vent inside the cooking chamber, rather than in the entry, has proved problematic again and again.

Good thing they have that dark slate cladding over the door, that will help mask the smoke stains.
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Old 03-30-2010, 03:30 PM
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Default Re: Flue w/sonotubes as forms?

Just to add to what Dmun said, the concept of using the flue gases to heat the masonry is a great idea for masonry heaters and fireplaces, but since the cooking is done after the charging fire is complete, it is kind of pointless for pizza or bread.

The danger of using flues over 30 degrees is a potential buildup of flammable soot which can catch on fire and destroy the appliance, plus draw issues.
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Old 03-31-2010, 03:23 AM
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Default Re: Flue w/sonotubes as forms?

The castable refractory is thixotropic. ie it becomes more fluid if you get a handful of the stuff and shake it. Too much water in the mixture results in a weaker product. Don't mix up too much at a time. Good luck.
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