Flue Pipe Estimator?

[LSaupe]

Is there a flue pipe design tool out there anywhere? Whant to check to see if my system is reasonable (just cant get good airflow).

Running two 90's, two 45's have about 35' of elevation and 45' total in pipe length.

Larry S.

 

[BJ64]

I'm just bumping the thread and leaving 2 cents behind.

I am not exactly a knowledgable person on this and in no way an expert but ...

I am afraid we have too many kinks in the system and too much pipe. We need to know about the stove to be sure.

My little Lopi has a max of (I believe) 180 degrees of turns an 30 some feet of stack total.

If I understand your description correctly your system has 270 degrees of turn, 35 feet of rise, and about 10 feet of lateral. My little stove would croak over dead with this.

 

[LSaupe]

Yep, thats it in a nutshell.

It is an Avalon Olympic.

 

[fossil]

That's far from an ideal flue setup for good draft, Larry. Got a diagram or some pics? Any ways you can think of to re-design the system with fewer directional changes and a lot shorter horizontal run (or eliminating it altogether)? Rick

 

[LSaupe]

I will try to post some pics. Too dark tonight to get a some shots. Has to run outside through a side wall then up two stories.

Will post some pics soon.

Larry S.

 

[LSaupe]

Here are some pics of the installation. See anything obvious?

 

[BrotherBart]

What I see is about 15 or 16 feet of vertical pipe? What am I missing here?

 

[fossil]

I thought there was something like a 10 foot horizontal run between the stove and the vertical exterior chimney...I'm not seeing that here...is there something I'm missing? Is the stove in the room just inside the exterior wall, or is there a closet or room or something between the stove and the outside? Rick

 

[LSaupe]

Yep, I was WAY off on the lengths. The long sections are 6" 4 footers. So about 20 feet of vertical rise and 3 feet of horizontal (between the stove and vertical pipe).

My guess is that the shorter length hurts in this situation? Is there a code standard out there some where for this type of installation?

Larry

 

[Brian VT]

From 2' below your cap you're supposed to have 10' horizontal clearance before contacting anything (your roof in this case).
You should definitely see an improved draft by adding some height. You'll probably need a roof brace. Be sure to use the same brand of pipe.
Ditching the 45s and going straight up through your eave would also help but I'd try just adding the height first.
Enclosing your chimney is a third option. This will help keep the flue temps. up and also help get the draft started sooner when lighting a cold stove.

 

[LSaupe]

10 feet. Heck I have zero feet. Thanks for the input. Can any one direct me to a building code for this type of installation?

 

[Brian VT]

(broken link removed to http://www.duravent.com/docs/instruct/L150) Dec05.pdf

edit: that doesn't work well.
Try this one: (broken link removed to http://www.selkirkcorp.com/metalbestos/)

 

[LSaupe]

Thanks.

Ran across this one as well while there.

(broken link removed to http://www.duravent.com/docs/bulletins/2008/45_elbows_product_bulletin.pdf)

 

[LSaupe]

Great references. I got good measurements now (sorry for the gross errors originally).

The bends I thought were 45's are actually 30's. Total outside vertical hight is 173". Internal height (from stove connection to pipe horozontal centerline is) is 26". Total piping height is 199" (16.6 feet). Total pipe length is 22.6 feet. This includes one 90 (at the stove), one cleanout "T" just outside and two 30's.

I have a 34 degree pitch on the roof with only 2 feet of stack above the edge of the roof. To get the 10 foot horizontal clearance (from the 2 foot below the cap reference) I will need another 7 feet of pipe. (plus a support).

Think that 7 feet of vertical pipe will help on drafting?

Gotta love spending several thousand $$ for a professional installation to have to deal with this garbage.

 

[Brian VT]

Think that 7 feet of vertical pipe will help on drafting?

It should help a lot.

 

[fossil]

Agreed, that oughta do the trick. Rick