Perlite Concrete on free form igloo

[splatgirl]

Re: Perlite Concrete on free form igloo

Please do keep us updated on this! I know your chimney R&D will be helpful to more than a few members, and the subject of indoor WFO's seems to be getting a ton of action lately on several threads.

[martywatts]

Chimney throat adjustment

After last nights smoke leaking I was a little disappointed. I finally decided to open up the throat a little as shown in the pictures. It seemed that most of the smoke was leaking past the throat on the sides. I cut the throat to curve from the edge of the oven opening up to match the width of the flue liner. A little dusty for an inside job and unfortunately I nicked a few bricks with the grinder wheel, but I did manage to get a nice curve. I loosely put the chimney back together, temporarily taped the joints with aluminum tape and built fire number 4. Not a lick of smoke leaked this time. I plan to keep the chimney in its temporary unmortared state until the curing process is done and I have seen enough fire conditions to be sure the chimney is working up to expectations.

[nissanneill]

Re: Perlite Concrete on free form igloo

Marty,
another possible solution if you continue to get smoke out of your front archway is to make a door or even a blind to fill the top half of the opening thus making it harder for the smoke to escape with the rush of air into the oven. A top half door will also force the smoke up your generous flue.


Neill

[dmun]

Re: Perlite Concrete on free form igloo

You might also consider a draft door to channel air and smoke on startup. Your oven is unlikely to leak smoke once the fire's going.

[Tscarborough]

Re: Perlite Concrete on free form igloo

I plan on making the front arch 2" lower than the inner arch to help with the smoke leaking. It appears yours are the same height?

[martywatts]

Re: Perlite Concrete on free form igloo

I plan on making the front arch 2" lower than the inner arch to help with the smoke leaking. It appears yours are the same height?
I thought about doing that. I think it would have made the difference of smoking or not smoking for my oven. I was concerned about the ease of using the door. Tipping the door under the dropped section would work just fine.

I have also considered an inner and outer door with a damper or air control device. I may still do that. So far no more smoking. Opening up the throat made a huge difference.

I am also considering making a clean-out for the lower part of the flue by cutting a square hole in the first tile as seen in the photo below. Since I have got things working for now I am hesitant to make any changes though.