Hey all! I recently purchased a wood stove insert for my fireplace. The installation instructions for stove say use a minimum 6" exhaust. My chimney is 6"x12" terra cotta lined and is on the exterior of house so I know I need to insulate the liner. I was thinking of doing a pre-insulated 4" flex liner which would make it a 5" diameter then I know I wouldn't have issues putting it down chimney. Does this sound reasonable? Or am I asking for problems? Thanks
6" stove pipe reduced down to 4"?
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Thanks, that's kinda what I thought. I could fit a 6" liner with insulation (7" diameter") if the old tile liners were removed. That's allowed?
Haha no bart it wont drive me up the wall if some one has all the info and makes an educated decision not to insulate that is up to them. I just try to let people know that in most cases it is required. And yeah hog oval will work like i said earlier
I have an insulated 6", so it's 7", would that be a pain to ovalize? Doable?
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Hopefully I don't start a big debate over this, but I didn't think you NEED an insulated liner if the chimney's on an outside wall. I got an insert last week and the installers didn't put in an insulated one and it seems to be working fine. My draft has been great while burning all weekend.
By code unless you have the required clearance between the outside of the masony to combustibles the liner needs to be insulated not to mention the fact that especially on an exterior wall it will preform much better being insulated.
Is it preinsulted? if so i don't think it can be ovalized now no. But it can be ordered that way from some manufacturers or just get an ovalized 6" and wrap it yourself
Owen1508
Minister of Fire
Hi,
I've got the same problem. My damper opens 4" - does the ovalized liner work here, or not if I have to put insulation around the liner?
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Do I have to take out the damper?
I don't want to spend $145 if this is not going to work. Also my chimney is approximately 15' high - somewhat less after deducting the height of the stove/insert which I haven't bought yet.
I've got the same problem. My damper opens 4" - does the ovalized liner work here, or not if I have to put insulation around the liner?
(broken link removed)
Do I have to take out the damper?
I don't want to spend $145 if this is not going to work. Also my chimney is approximately 15' high - somewhat less after deducting the height of the stove/insert which I haven't bought yet.
If the flue is generally wide enough, taking out the damper would be the way to go. Ovalizing or undersizing the liner is better only done when all other options have been exhausted. What kind of insert do you want to get? You will apparently just barely hit the minimum height for most units.
The flue is brick with two chambers, each 8" x 8". I've noticed that the stoves/inserts with the 6" vent are a lot cheaper than the ones with the 8" vent. So I'm going with something with a 6" vent. So the hard part is either getting past the damper or taking the damper out.
I figure it would be necessary to line only one chamber.
Are there any guidelines for the maximum height of the stove/insert? Obviously it has to be less than the height of the fireplace.
Do stoves/inserts require a minimum height of the chimney? Maybe it's good that my chimney's short? (Less chance of creosote condensing?)
I figure it would be necessary to line only one chamber.
Are there any guidelines for the maximum height of the stove/insert? Obviously it has to be less than the height of the fireplace.
Do stoves/inserts require a minimum height of the chimney? Maybe it's good that my chimney's short? (Less chance of creosote condensing?)
Short chimneys don't work well at all for modern stoves. Only a few will breathe easily enough to work well with an under 15-16' chimney. Fortunately it sounds like your chimney is just about right. It's really nice to have enough room above the insert to be able to get your hands in there for positioning and attaching the liner. There are other ways, but not as easy.
OK, we did it ourselves....we were able to remove the damper and didn't have to ovalize the liner at all. It's a good thing because although the liner was advertised as "flexible" it's actually fairly sturdy.
Some of the fire bricks from the fireplace fell out while we were snaking the liner.....I figure just pile them up inside the fireplace? The insert is smaller than the fireplace - I'm getting a surround for it.
The liner is coming down one of those chimney chambers - do I plug up the other one with insulation?
Some of the fire bricks from the fireplace fell out while we were snaking the liner.....I figure just pile them up inside the fireplace? The insert is smaller than the fireplace - I'm getting a surround for it.
The liner is coming down one of those chimney chambers - do I plug up the other one with insulation?
Plug all around the liner with mineral wool (Roxul) insulation so no heat from the insert goes up the chimney. Also pack the top of the liner at the chimney crown with insulation. Then cap it off properly so that no moisture gets in there. Put a healthy bead of silicone around the tile edge before capping to seal it tight. Cap off the second vent with a blank plate.
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