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The existing insulated chimney pipe has been corroded from the roof all the way down to the fireplace. It currently has a class A fireplace insert with a 6 inch opening that has been inserted into a standard open fireplace to reduce the amount of back dr
Posted by Elite Deals - Chris M. on 24 October 2013 04:31 PM

Our Answer:

Based on what you have described, I agree that the primary issue was oversizing of the pipe. It appears the insert was simply pushed into the masonry enclosure and is passively drafting into the 10 inch pipe. If the insert does indeed have an 6 inch outlet, oversizing by more than 1 inch can cause poor drafting, especially in a climate as cold as yours. Because of conflicts with product listings and safety, no adapters exist to change the diameter of Class A chimney pipe. Moreover, the anchor plate that is currently there is designed to work with one particular brand. If an adapter did exist, it may be difficult to determine whether or not it would work with the anchor plate. I believe it would be in your best interest to chisel out the existing plate and replace it with a new 6 or 7 inch plate. The top masonry enclosure is most likely made from castable refractory cement, which can be chiseled out without too much effort. The new plate can be installed and more castable cement can be used to affix it into position.

In Response to Question:

The existing insulated chimney pipe has been corroded from the roof all the way down to the fireplace. It currently has a class A fireplace insert with a 6 inch opening that has been inserted into a standard open fireplace to reduce the amount of back draft that came into the cabin, which might have been caused by a flue that was too large for the fireplace. Can we reduce the flue's inner diameter to get more draft effect out of the flue? Do you have an insulated reducing collar that we could screw into our 10 inch anchor plate that would reduce it to an 8 inch diameter? Can we then attach a new 8 inch Class A insulated chimney pipe? If not, what should we do?

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