How big to Flue?

[bookemdanno]

Guys, i'm wondering if a section of 8" diameter single walled black enamelled flue (woodburner first section) would be good for a chimney on a 36" Internal Dia Pompeii?

As far as flue goes, is bigger better, or would 6" (FB advised) be a better size?

I've a piece of 4" supersleeve, but it seems a bit puny.

Thanks!

[slowfood]

I Found that FB contradicts its self an awful lot in it's sales gumph when I did my research, When I read up on flues there it was all 8" which I must say out of all my ovens 8" certainly has the best draw.
Here is what I found out when I researched the flue sizing, hope it helps

Flue size. The US underwriters Laboratories state that it is best to use a flue as large as you need and no larger;
So if you were burning 12 lbs/hour of wood you would be generating 97,000 btu's and therefore need a 6" Flue (My 41" oven would burn less than this)
16.5 lbs/hr=7" according to The US underwriters Laboratories.
21.6 lbs/hr=8"
27.3 lbs/hr=9" and so on

Also I found this on an italian Oven building web site
Diametro del forno diametro minimo canna fumaria in cm
da 60 a 80 ----cm 20
da 80 a 120--- cm 25
da 120 cm in--- su 30

Costruzione e uso del forno a legna