Insert chimney insulation

[Ranger72]

I currently have a 4" flex liner through my masonry chimney which is approximately 11 - 12 feet long. It is terminated at the top with a cap/ plate. I plan to drill a hole through the top plate and run 2" steel tubing for outside air. (I'll put a 90 or probably a little more bend at the top with a screen to keep the rain etc out). Ok, do the question: I was planning to shove some roxul down around/ between both tubes as best I could. Do you guys think it is worth it? It's going to be tough to force large pieces down.

 

[SKOAL MAN]

I would worry more about increasing the diameter of your oak than the insulation! Also why run the pipe all the way to the top?

 

[Ranger72]

Whitfields don't have a large diameter OAK connection. It's raining today, but tomorrow I think I'll start. The reason I'm running the outside air to the top of the chimney is because it sealed air tight with a stainless cap/ rtv. Let's see how this goes.

 

[Peterfield]

FWIW, my installer said insulation wasn't necessary and added it would be good that it gets warm in the flue chamber so if power is lost he natural draft will help clear the smoke as the stove dies out. Sure enough, we had a power outage and and all the smoke went up chimney and out.