Oval Chimney Liner or something else?

[Gdp07]

Hello all.
I've come to the conclusion I miss my insert so much I need to buy another for the new house. I have decided in an Enviro Boston 1700. As far as fireplace clearances I will have more than enough to fit it in. The problem lies with the chimney.

When I measured the flue tiles yesterday I realized I can't fit a 6" liner down. The opening is a hair smaller or right on 6" by about 11" wide.

Is my only option ordering an oval liner?
Can I order a round liner and oval it myself?
Or am I missing something obvious right in front of me?

 

[bholler]

Hello all.
I've come to the conclusion I miss my insert so much I need to buy another for the new house. I have decided in an Enviro Boston 1700. As far as fireplace clearances I will have more than enough to fit it in. The problem lies with the chimney.

When I measured the flue tiles yesterday I realized I can't fit a 6" liner down. The opening is a hair smaller or right on 6" by about 11" wide.

Is my only option ordering an oval liner?
Can I order a round liner and oval it myself?
Or am I missing something obvious right in front of me?

You dont want to ovalize without the proper equipment.

 

[begreen]

Another option may be breaking out the tiles to make more room for a round liner. Or, yet another option to consider is using DuraLiner oval pipe which is 4.75" x 7.75". This pipe is preinsulated and should work if the install is a clear straight down shot. @Hogwildz used DuraLiner for his installation.
http://www.duravent.com/Product.aspx?hProduct=6

 

[Squisher]

I used the duraliner oval for my insert installation too. And I have been super happy with the performance. Easy starts and strong draft on a relatively short chimney. About 15'. A high quality option IMO. I used a flex section to get through the smoke shelf/damper area and rigid for the rest. The rigid also allowed me to extend out the top of the chimney to gain more height. As I recall the duraliner instructions allow for extending the pipe out as far as you want as long as no connection is exposed.

 

[Gdp07]

Thanks Squisher.
You ended up answering my next question about using flex and rigid. I see you can mix the two. What size did you end up going with anyway? When I ran the calculations it looks like the 4x7 oval is less area then a 6" round and the 4x10 is larger. Would guess go with the larger?

 

[ddddddden]

Looks like the "oval" liner is a rectangle with rounded corners.

4 x 7" rectangle = 28 sq in.

6" round ~ 28 sq in.

I think the 4 x 7" is intended as a substitute for 6" round.

 

[begreen]

Gdp07 how tall is the chimney?

 

[Gdp07]

From where the insert will connect to the top of the chimney will be about 17', maybe a little more.

 

[bholler]

Thanks Squisher.
You ended up answering my next question about using flex and rigid. I see you can mix the two. What size did you end up going with anyway? When I ran the calculations it looks like the 4x7 oval is less area then a 6" round and the 4x10 is larger. Would guess go with the larger?

You can only mix the two with duraliner

 

[begreen]

From where the insert will connect to the top of the chimney will be about 17', maybe a little more.

I'd go with the recommended 4x7. You can use an oval to round flex section to connect the stove.