Excessive chimney length?

[mrotter]

I was just wondering, are there any downsides of having really really long chimney, like 3 metres long? Or is it that the longer chimney the better?

[deejayoh]

not really. A longer chimney will draw better than a short one. Maybe it takes a bit longer to heat up, not sure

[UtahBeehiver]

Why do you need or want a longer chimney? Do you need to clear a roof line, increase draft due to too small a ID chimney, or just looks? You will have to cross brace a 9 foot chimney for wind load.

[mrotter]

Why do you need or want a longer chimney? Do you need to clear a roof line, increase draft due to too small a ID chimney, or just looks? You will have to cross brace a 9 foot chimney for wind load.

Yes, one of the causes for this is that I need to get preferably above roof, sure, I will need a brace to make sure that chimney "pipe" does not move when windy weather. I looked up some chimney math equations and it seems that length is not really a problem. Thanks.

[fox]

No problem if you use an insulated chimney flue of the correct diameter.

[MarkJerling]

I was just wondering, are there any downsides of having really really long chimney, like 3 metres long? Or is it that the longer chimney the better?

A taller chimney draws better. Mine's plenty tall and it works fine.

[david s]

Here's one I built with a tall flue for exactly the same reason as yours. The oven fires and performs pretty much the same as one with a short flue.

[mrotter]

Here's one I built with a tall flue for exactly the same reason as yours. The oven fires and performs pretty much the same as one with a short flue.

Nice, thats pretty much how long I would like it. Thanks.