Jotul Combifire 4b pipe to 6"

[ejmckenna1]

I have an old Jotul 4b that has an outflow pipe on the top that has an OD of 6.75". The pipe that vents to the outside of my house is the more standard 6". Of the three stoves shops near me, 2 refused to give advice and one said I could step it down with a 7" to 6" adapter. It seems to me that larger 7" end would be way to loose on the stove. I do have thet original length of pipe for the stove and I'm wondering if there is a way to crimp the end down to 6" prior to the 90 degree fitting.

 

[begreen]

This stove can operate as a stove or fireplace. The larger diameter is much better for fireplace operation. The measurement is odd. In the manual, the flue outlet on the 4b is listed as 8".

 

[ejmckenna1]

I'm sorry, It looked so similar. It is actually a Jotul Combifire 1B. I see now it has a 6.9" OD outlet pipe.I suppose that should be fine to fit to 7" to 6" reducer. https://www.jotul.com/sites/usa/files/2019-11/Jotul_Combifire_1B.pdf

 

[begreen]

The smaller Combifire 1B requires 7" stove pipe and chimney. The crimped end should fit the flue collar.

 

[ejmckenna1]

The smaller Combifire 1B requires 7" stove pipe and chimney. The crimped end should fit the flue collar.

Yes, makes sense. The pipe leading to outside of the house is 6". I realize the 7" to 6" reduction is a no-no, but I don't see any way around it. Maybe I put the reducer right at the outlet and then it's 6" pipe up to 6" 90 degree and then out?

 

[begreen]

One option is to replace the stove with one that requires a 6" flue. Otherwise, with the two 90º turns above the stove smoke spillage on reloads is a possibility unless the chimney is very tall. What is the 90º elbow connecting to, masonry or steel chimney?

 

[ejmckenna1]

One option is to replace the stove with one that requires a 6" flue. Otherwise, with the two 90º turns above the stove smoke spillage on reloads is a possibility unless the chimney is very tall. What is the 90º elbow connecting to, masonry or steel chimney?

 

[ejmckenna1]

The pipe passes through a brick wall, but via steel piping, once outside it hits another 90 and heads up along the outside of the house. I would say the pipe on the outside of the house is at about 16' long because it caps out way above the roof level on the second floor.

 

[begreen]

It may work, but probably won't make the inspector or insurance company happy.