Woood Stove Flue

[larry4406]

Newbie here -

I am contemplating removing a gas fireplace and its flue, and replacing it with a new pre-fab stainless steel flue for a wood burner and then installing a wood stove.

The house has an internal chase where the old gas fireplace flue, furnance flue, and water heater flue runs. I would want to run the new wood flue in this same chase and I appear to have sufficient clearance.

Wood stove would have a vertical stack off top, stove pipe riser a few feet, turn 90 degrees into wall via thimble/adapter piece, then 90 degrees up inside the chase and straight up to the roof. I do not want the chimney straight up thru the ceiling.

I would not want to install the "T" at the bottom of the riser as there would not be any access to it. Any problem with this approach?

See attached sketches. In the first sketch, I drew the chase in red and want to delete the T at the bottom. Basically, at the wall thimble/adpter piece would be two back to back elbows one pointing down to the stove and the other up to the chimney riser.

 

[SKIN052]

Sketch is way too small to see clearly. Only problem i would think of is, how would you clean it without a T?

 

[larry4406]

Sorry about the sketch, best I could come up with.

Regarding cleaning, at worst this could be done by removing the stove pipe from the thimble, although I would think with flexible brushes it would follow the flue back to the stove.

The Heatilator in my basement has a 90 off the top of the unit, runs about 3' horizontally, 90's up, and then straight up to the roof. All of this is in the chase. That said, this is why I was contemplating same for the wood stove flue, only difference is that the horizontal run would be thru the wall via the thimble piece adapting stove pipe to proper flue.

 

[Dune]

Would there be a way to access the clean out if you were to make an access?

 

[SKIN052]

I do not see how you are going to be able to install the Prefab in the chase without having access to it? You will have to create an acces point to get the class A pipe installed, right?

 

[begreen]

Why would you not put an access door on the outside? Aesthetics? More work?

 

[larry4406]

The chase exists. It is internal to the home. On one side is my great room with gas fireplace. On the back side is a bedroom.

I will demo the great room side to get the gas fire place out and remove its flue. Then proceed to install the new wood flue with wall adapter piece, then install drywall/concrete board to enclose the chase, then install stone facade and hearth, then connect the wood stove.

Don't want an access panel in the bedroom.

 

[SKIN052]

Got it. Your sketch does not show that at all. Very few options come to mind at this point. You can make a well hidden access panel, maybe add it to the left or right of the chase in the great room? You don't need much room.

 

[larry4406]

Does there truly need to be an ash dump cleanout at the bottom of the riser? My Heatilator wood burner does not have that (again - two back to back 90's with a short piece about 3' between the ells). The heatilater is in the basement and no chase access.

The attached is an excerpt from Simpson Duravent DVL series. The catalog shows a Tee with a cleanout at the bottom. Can an elbow be used in lieu of the Tee.

 

[SKIN052]

Sounds like it will indeed work, where as the smoke will indeed go up the chimney. But if you put a 90 in place of the T how is the rest of the chimney being support? And my main question is how would you ever clean it with out pulling out the stove?

 

[Dune]

Yeah, I am not an expert but I don't think thats legal.

 

[cmonSTART]

Most building code dictates that a chimney shall have a cleanout.

Also, the Simpson/Dura Vent support bracket depends on using a Tee at the bottom. It will not attach to an elbow.

 

[larry4406]

If I have to use the tee, can I add about a 6 to 8' straight extension to the bottom of the Tee and move the cleanout cap to the bottom of this extension? This would allow the cleanout to be in the basement in the water heater closet where I would have access. Obviously, this extension would be fire stopped where it went thru the chase floor.

I looked again at my wood burner Heatilator. It has two approx 30 degree ells back to back with a 3' straight in between - no cleanout.