What size oval pipe = 6" round?

[gizmos]

Hi all,

I am running a liner in the chimney. The stove calls for a 6" stove pipe. My terracotta liner in the chimney measures 6" ID by 17 1/4" ID. I wanted to run oval ridged pipe down. So do I need to increase the size of the pipe when I go from 6" round to oval?

Simpson dura vent oval measures 4 3/4" by 7 3/4" = 6" pipe.

Ventinox hiflex says ("When the 8" is ovalized it measures 4" x 10 1/2" O.D. (giving a 6" round capacity for volume")"????

So which measurement is correct? I was just trying to figure what size oval = 6" round and am now confused on the size of oval pipe to run?

Thanks much

Mark

 

[theheatelement]

Duravent bought ventinox this year so i'm sure you could call them and get both.

Hi all,

I am running a liner in the chimney. The stove calls for a 6" stove pipe. My terracotta liner in the chimney measures 6" ID by 17 1/4" ID. I wanted to run oval ridged pipe down. So do I need to increase the size of the pipe when I go from 6" round to oval?

Simpson dura vent oval measures 4 3/4" by 7 3/4" = 6" pipe.

Ventinox hiflex says ("When the 8" is ovalized it measures 4" x 10 1/2" O.D. (giving a 6" round capacity for volume")"????

So which measurement is correct? I was just trying to figure what size oval = 6" round and am now confused on the size of oval pipe to run?

Thanks much

Mark

 

[CarbonNeutral]

The Simpson is definitely 6" round equivalent

 

[gizmos]

Ok thxs,
I'll stay with the oval ridged dura liner. The web site says that the ridged pipe is insulated. Is there any need to wrap it with additional insulation?????

Another issue is that from the top of the block off plate to the top of the chimney is only 9 feet. How far above the chimney can I run the liner ? Or how far above the chimney should I run the liner??? I'm assuming I should run round pipe above the chimney or can I continue with the oval pipe???? Any suggestions please and thank you.
Mark

 

[CarbonNeutral]

No need for any additional insulation, except around any flex you have through the smokeshelf/damper (though you will not be able to get it down your flue - so either add after, if you can (very difficult), or do what I did and stuff rock wool up into the smoke shelf area).

You use the "oval extend a cap" to cap oval - you continue with the oval on the parts above the chimney. There are supports available once you get above a certain height - the manual available on Simpson's website has more info. Your stove manual should give recommended min height.