Flue height above chase?

[jesse72]

Hello, I am installing a class A flue inside a wooden chase. I am unsure of the height that it needs to extend above the chase? I understand the 3-2-10 rule but am not sure that applies to a chase that is already the highest part of the house. I would rather it be as short as possible

Here is a pic of the chase with the old zero clearance flue that I already removed

Thanks!

link to my current project thread:

Removing FMI 42GC zero clearance and alcove build for Hearthstone Mansfield 8012

Hello all and thanks for all of the helpful info you have created on this forum. I am in the process of removing an FMI 24GC zero clearance fireplace that was original to the home when it was built in 1988. It has a wood framed / wood sided exterior chase on our 2 story home in which the...

www.hearth.com

 

[jesse72]

This may have answered my question, a diagram from Rock Ford Chimney Supply. Looks like 6" is all that is required above the chase. Can anyone confirm?