Round Flue Vs . Square Flue

Modern and vintage hand fired coal stove are similar to a wood stove and in some cases can burn either. They need to be regulated and fed by hand usually every 12 to 24 hours depending on your usage. They require no power to operate making them ideal for rural settings with long power outages.
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Den034071
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Post Sat. Apr. 22, 2017 10:43 am

See New Chimney Post jack
Jack from Lehigh Valley

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Hambden Bob
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Post Sat. Apr. 22, 2017 11:01 am

Seems that's always been a Deep Discussion here,and rightfully so...

The Round vs Square/Rectangular Theories have been a part of Stove Design Discussion for better Combustion Characteristics and Thermodynamics.....

I'm towards the Round Crowd myself. The Cylindrical Swirl seems to make it go well,in less than Laymans' Terms !
Remember,There's No Sight Like Anthracite !......Hambden Bob

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coaledsweat
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Post Sat. Apr. 22, 2017 11:31 am

Not sure if I'm correct here but I'll give it a shot. The area to surface ratio is better on a round flue. Along the surface of the flue, the movement of gasses is stalled and turbulant, at center, the flow is laminar. The less surface area, the lower the amount of velocity upset per square inch of cross section. Make sense?
Nothing is impossible for people who don't have to do it themselves.

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Rob R.
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Post Sat. Apr. 22, 2017 12:24 pm

I think insulation and height makes more difference than square or round, assuming the flue is properly sized.

Insulated round flue would be my top choice.

Sunny Boy
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Post Sun. Apr. 23, 2017 6:54 am

Rob R. wrote:I think insulation and height makes more difference than square or round, assuming the flue is properly sized.

Insulated round flue would be my top choice.
That would be my assumption too.

It's heat differential and retention of that heat, plus height, that is the driving force to make draft.

I had a 3 story high, 6 inch round single-wall pipe chimney for my potbelly stove. Very difficult to not have back drafts when starting a cold stove. And once the stove was running, the draft was too poor to idle the stove down because of the heat loss in the chimney.

I have a tall brick chimney now, no liner with rounded corners. My range has about the same coal capacity as my small potbelly stove was. With this brick chimney - built back in the days at the height of coal use - it is easy to start a fire, and the range will idle for hours at a steady burn as low as .005 mano reading.

Paul
So many stoves - so few chimneys. I must be coal-stone crazy.

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oliver power
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Post Sun. Apr. 23, 2017 7:40 am

I agree with others. Really doesn't make a difference. I do like the round flue better. Don't really know why. MAYBE a little stronger than the square flue. One thing for sure, the round would give more room for insulation. I put round in my masonry chimney.

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waldo lemieux
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Post Sun. Apr. 23, 2017 7:52 am

I had a round flue before I switched to coal. It was always easier to clean a round flue with creosote buildup, no corners...
When faced with a seemingly impossible task, my grandfather always said "can't never can, untill try comes along"

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freetown fred
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Post Sun. Apr. 23, 2017 7:55 am

That's why they make square brushes WL. LOL
"A people that values it's privileges above it's principals, soon loses both"--Dwight D Eisenhower

waldo lemieux
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Post Sun. Apr. 23, 2017 8:05 am

They make brushes that are square???? :oops: I always bought a oversize round brush and took it down to my barber to make it square, used to charge me extra to get his scissors sharpened after....
When faced with a seemingly impossible task, my grandfather always said "can't never can, untill try comes along"

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freetown fred
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Post Sun. Apr. 23, 2017 8:14 am

That's a good barber my young friend :)
"A people that values it's privileges above it's principals, soon loses both"--Dwight D Eisenhower

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