Liner install questions

[ikessky]

I used the search function, but can't find a topic that answers my question. I'm installing a add-on furnace that will be vented to the existing masonary chimney. Last night we pulled out the furnace PVC pipes that someone had run up the chimney and took a look at what condition the flue was in. It was a little dirty, but my FIL said that the flue looked good and he would hook up the stove and start using it. I would rather be safe than sorry and have decided to install a SS liner (they really aren't that expensive). The inside dimensions of the clay flue is 6.5" square, so a 6" liner should fit. The chimney is a straight shot from the basement to the roof and the amount of lining I'll really have to use is probably about 18'-19'. The chimney is interior with only about 3-4' sticking above the roof.

My question has to do with the T that comes in the kits. I understand that it's not difficult to shove the liner down the flue, but how does this T get hooked up? Will I have to enlarge the current hole that is in the basement and cement the T in or how does it fit in the existing flue?

Any suggestions would be helpful and thanks in advance.

 

[ikessky]

Here's a diagram of what I am talking about. Can I just cut the green area out and push the T into that spot? Do I even need to re-block that area with cement or can I leave it open to have access to the cap on the bottom of the T? In my mind, when using a stainless liner, the chimney and flue are really only being used as a pass through thimble or a spacer between liner and combustibles aren't they?

 

[LONDONDERRY]

Well I had a similar situation as you describe. I purchased a wood stove insert and wanted to put a ss liner inside. My clay liner is 6-1/2" x 10-1/2". I was going to put in a 6 in diameter ss flex liner but my concern and you'll have to take a closer look is the flue clay tiles are not perfctly stacke one on top of another. So if the i.d. of the ss liner is 6 and the o.d is 6-1/4 if the tile is off by 1/4" I'll have all types of issues snaking a liner down the top of a chimney. I visted 2 stove shops and wil some calculations I don't need a ss liner all the way up, just 5 ft about the stove will work.

Frank

 

[ikessky]

Actually, I went up and measured again. The ID of my flue is 6-7/8". From the looks of the flex liners, they are around 6-3/8". I'm pretty sure it should go in without too much drama.

I hope some others jump in and answer my original questions though.

 

[kd460]

You can also "ovalize" the 6" liner to give you more room. Can't answer th T question, but you are smart to go with a full liner. Easy to clean. Partial liner? Pain to clean. KD

 

[ikessky]

After looking at some downloaded installation instructions, I can now see how the T is properly installed. The issue they don't address is cleaning of the liner. With the bottom of the T capped, where does all the stuff go? Do I have to remove the stove pipe and vacuum out the T after cleaning, or will I have to chip out my masonary work to uncap the bottom of the T?