The diameters are round 6" to 7" oval. (standard for Hearstone and others). You would never have to change this again!
The item "Hearthstone Woodstove flue pipe, heavy duty stainless steel, oval to 6 round" is in sale since Saturday, October 7, 2017. This item is in the category "Home & Garden\Home Improvement\Heating, Cooling & Air\Fireplaces & Stoves\Replacement Parts". The seller is "jhebb57" and is located in Campton, New Hampshire.
This item can be shipped to United States.