Downsizing 6" woodstove to 5" flue liner and other issues

Brad,

The short answers: Current situation is bad, yes remove the liner, no don't down size it to 5 inch, yes it could cause a problem with the furnace in multiple areas.

Now a little explanation. IF I'm understanding you correctly you have an 8 x 13 flue with a terra cotta liner with inside measurements of 6 x 11. You tried to drop a 6 inch liner inside the tc to connect to your wood stove and then the oil furnace would vent around the outside of the stainless liner but inside the terra cotta in the same chimney. Upon trying that the stainless liner came apart in the chimney and it doesn't even reach to the top of the flue now. Yes??

You need to remove the stainless - somehow, and start over. Try lowering a rope with a hook on it down through the inside of the stainless, hook it on the T and try pulling it up and out. You're not supposed to have a solid fuel appliance sharing the flue with another appliance. You're also not supposed to vent one around the outside of the other. You have created a situation where the oil furnace may not be able to vent properly and will push carbon monoxide back in the house and the wood stove could produce enough build up in the top section of the chimney, where the stainless fell apart, to block any furnace exhaust that made it that far from getting out the top of the chimney.

Like I said, get the stainless out, hook up the furnace like it used to be and either build a new chimney for the wood stove or at least call a someone in your area who can show you the right way to do this. Try www.csia.org and see if they have any listings for your area. Depending on the actual size of your chimney it may be possible - MAY BE, to put two 6 inch liners in the current chimney. Good luck.

Brad,
They also make a 5.5" liner. I had the same problem getting a 6" liner down so I bought a 5.5" and it drafts great. But don't do this if your sharing the same flue with your furnace. Like the prior post said its bad!

Just fyi - many times a 6 inch liner will fit inside an 8 x8 or 8 x 13 terra cotta if there are no major offsets or bends inside the current liner. However, liners for solid fuel appliances are to be insulated and when you add the extra room for the insulation it no longer works.

wvbrad said:

Here are my questions: how bad is my current situation?

Brad

Click to expand...

Pretty bad!

You can get ann oval or even rectangle liner, but you cannot use the same flue for both those appliances cause it is not sized for both.....in other words, you'd need to be able to get two 6" flues down there.

Even if we give you the benefit of 5.5", you'll never get two of them down!

What they call 8 x 12 flues are usually about 6.25 x 10.5 ID.

Don't downsize the stove or the oil furnace for that matter.

Power venters are acceptable but be aware that they can also cover the side of your house with oil soot if there is a problem at some point. Save the money from that and put up a second chimney. Masonry or class A.