Brick Chimney Flue

[MarkJerling]

Why is the dome supported with some wood? Is it in danger of collapse?

[Andytibbles]

Hi David

A= 141cm door to rear (width of the dome is about 126cm)
B = 46cm
C = 60cm height of flue gather , 46cm width gather


The config of the existing pizza oven is that the dome oven has one flue gather in at the entrance which then leads up and across by 1.5m to the chimney.

[Andytibbles]

Hi David , that is very helpful thank you. We will take some more measurements and pics and report back. Thank you

[david s]

Some more pics would be most useful. The dimensions shown on the drawings attached would help. The attached photo shows the typical set up. It is a 1600mm internal diameter. Your 250 x 250 mm chimney should be quite adequate. Can you provide
A. oven internal diameter
B.flue gallery width
C. flue gallery depth
D. chimney cross sectional area (yours 250 x 250mm)
E. chimney height
What currently supports the chimney? Any bends required should be no flatter than 45 degrees.
Also check local building code as modern requirements for chimneys may supersede the original.
Also what fuel is the oven going to use?

[Andytibbles]

Thank you , I think the extractor is for something else.
We were thinking of rebuilding and installing a pumice liner 300mm however client would prefer to use the existing chimney and build up from there.

[MarkJerling]

250x250mm sounds about right, but it would be good to know the internal measurements of the oven to do a few calcs.
I notice from your photo that there appears to be an extract hood in the picture. Regardless of the flue, it would make sense to have an extract hood as well. In many jurisdictions, it will be a requirement in any event. Consider too fresh air supply for combustion as well as height of chimney and potential for down-draft.

A potentially better solution than a 250x250mm square flue would be a 300mm dia. round flue, or a 250mm dia. round flue, in stainless steel. These will be far easier to sweep than a square flue.

[Andytibbles]

Hi all , we are restoring an old internal pizza oven on a listed building
The pizza oven opening is around 900mm wide by 450mm tall. (arched)
The existing chimney stack has an internal measurement of 250x250mm and has been sealed over internally before roof level
We have been tasked with extending this chimney up and out through the roof so that the customers can use again.
The foundations have been checked and are ok , but we are wondering if the flue diameter will be too narrow for the pizza oven to work effectively
They would like to extend the existing stack however we have said rebuild from scratch at a wider diameter ,
Are there any experts that can calculate for us if we are right!