Do I need a stove pipe?

[Chrisg1964]

im installing a used quadrafire 4100. My masonry chimney is rectangular. The used stove came with 6" round stainless chimney flex pipe. It won't fit. I've been advised I need 7" oval.

What is the ration for installing stove pipe all the way up the chimney? The chimney is in good condition, would it work installing pipe from stove to about 5-6' in chimney?

Pros/cons please?

 

[brad wilton]

bholler will be along soon

 

[begreen]

Is it an absolute necessity, no but it is definitely safer and better for stove performance and cleaning to fully line the chimney. In a city local code may insist on this. Check with the inspecting authority and your insurance company. They probably will insist on it being lined. What is the tile liner size in the existing chimney?

A full, insulated liner is going to contain the flue gas heat up to a very high temperature. The insulation will prevent this heat from migrating through the brick to adjacent wood framing that may be touching the chimney. Keeping the flue gases hotter will mean a cleaner flue too. This is a hot fire in your house. Treat it respectfully and safely and you will enjoy it for a long time.

Stubbing not only loses these benefits, it also means the stove needs to be pulled when cleaning the flue to get all the crap that will fall down around the stub.

 

[fossil]

The stove manufacturers all specify that the stove is to be connected to a flue system of the same diameter as the flue collar on the stove. If the flue only extends a little ways up into a larger chimney, there will be large and abrupt change in the velocity of the flue gases at the point, allowing a lot more cooling along the way to daylight, which encourages the condensation of creosote onto the flue/chimney interior surfaces. It also adversely affects draft, decreasing system performance. It's also impossible to sweep (clean) without removing the stove. You'll also lose a whole lot of heat from the firebox surrounding the stove up and out the chimney. You really need, for overall system performance and maintainability, a full-height stainless steel liner, sealed top plate, and a block-off plate above the stove in the firebox. Anything less is an inferior, underperforming system. Rick

 

[Chrisg1964]

Ok. That all makes a lot of sense.

Next question. Can I ovalize a round pipe by sandwiching between to 3/4 ply wood sheets and through bolting it will all thread and tightenong to apply even pressure?

I've gotaQuote for $800 for 25' of oval pipe. Is That reasonable?

I'm also located in Pennsylvania, is insulating the pipe recommended?

I would measure the tile liner where? above the flue? Do most remove the flue or fish through it?

The stove manufacturers all specify that the stove is to be connected to a flue system of the same diameter as the flue collar on the stove. If the flue only extends a little ways up into a larger chimney, there will be large and abrupt change in the velocity of the flue gases at the point, allowing a lot more cooling along the way to daylight, which encourages the condensation of creosote onto the flue/chimney interior surfaces. It also adversely affects draft, decreasing system performance. It's also impossible to sweep (clean) without removing the stove. You'll also lose a whole lot of heat from the firebox surrounding the stove up and out the chimney. You really need, for overall system performance and maintainability, a full-height stainless steel liner, sealed top plate, and a block-off plate above the stove in the firebox. Anything less is an inferior, underperforming system. Rick

 

[bholler]

Everyone else pretty much covered it and yes insulating it is recommended. As far as removing the old liner or not it depends on the situation for fireplaces most of the time we do not remove the old tiles we just ovalize if need be. And you are correct to match the volume of a 6" round you would ovalize a 7" round. But as long as you have enough height ovalizing the 6" would probably work just fine

 

[Chrisg1964]

How and why would you remove the old liner? How do you ovalize the pipe?

Everyone else pretty much covered it and yes insulating it is recommended. As far as removing the old liner or not it depends on the situation for fireplaces most of the time we do not remove the old tiles we just ovalize if need be. And you are correct to match the volume of a 6" round you would ovalize a 7" round. But as long as you have enough height ovalizing the 6" would probably work just fine

 

[bholler]

How and why would you remove the old liner? How do you ovalize the pipe?

If the old liner was already in bad shape and it was the only flue in the chimney we would probably break it out. We use a tile breaker on rods attached to a drill. It spins around and breaks up the old tile then it gets shoveled out the bottom. We ovalize with an ovalizer the way you proposed doing it with plywood would probably work pretty well never seen it done that way but it sounds like a decent way to do it.

 

[Chrisg1964]

Out of curiousity what does an ovalizer look like?

If the old liner was already in bad shape and it was the only flue in the chimney we would probably break it out. We use a tile breaker on rods attached to a drill. It spins around and breaks up the old tile then it gets shoveled out the bottom. We ovalize with an ovalizer the way you proposed doing it with plywood would probably work pretty well never seen it done that way but it sounds like a decent way to do it.

 

[bholler]

It is a set of adjustable rollers with a handle on one of them so you can turn it and feed the liner through you make a few passes adjusting the rollers closer and closer till you get the desired size

 

[Chrisg1964]

That sounds pretty easy to build too. Do the pipe squish fairly easy? Pair of rolling pins mounted to like a 6x6 one fixed one movable. All bolted to a plywood base?

Just do small squishes on the length of the pipe a couple times

It is a set of adjustable rollers with a handle on one of them so you can turn it and feed the liner through you make a few passes adjusting the rollers closer and closer till you get the desired size

 

[begreen]

Chris, you are clipping the [ off the beginning of the quotes. A quote needs that open quote bracket [ to read correctly.

with:

foo

without:
quote] foo [/quote]

I fixed the previous quotes but left the last one unfixed.

 

[Chrisg1964]

Oops sorry fat fingers tiny iphone

Chris, you are clipping the [ off the beginning of the quotes. A quote needs that open quote bracket [ to read correctly.

with:

without:
quote] foo

[/quote]

 

[begreen]

LOL

 

[Chrisg1964]

Found this looks fairly easy.

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LOL

 

[bholler]

Found this looks fairly easy.

Yeah i hate to clean liners ovalized like that they are typically uneven and many times kinked in spots

 

[Chrisg1964]

then the roller method it is!

Yeah i hate to clean liners ovalized like that they are typically uneven and many times kinked in spots

 

[bholler]

then the roller method it is!

I imagine it could be done with a board if you were very careful and consistent. That is as long as it is light wall liner heavy wall you would not be able to do that way

 

[begreen]

What are the current tile liner interior dimensions?