Class A Chimney 30 degree Rise and Run

[O Never Done]

Hi Forum members.

I'm wondering if anyone can help me figure out how far away a wood stove can be placed from the house chimney penetration at roof ridge.

Pipe will penetrate 1-story ranch ceiling and then make a 30 degree elbow in attic space.

There is 8 ft of headroom in attic (8 ft are of Rise)

Roof pitch is 7/12.

How far can of horizontal run can i make up in that 8 ft rise????

Do I need 2 ft of rise for every 1 ft of run , with a 30 degree elbow ? Or do I have this wrong.

So will I be maxed out at 4 ft of run with 8 ft headroom (rise)?

 

[webby3650]

Why the extreme offset? A straight run will always perform better.

 

[RobbieB]

30-60-90 rules

 

[webby3650]

30-60-90 rules

I’m not following you. ?

 

[webby3650]

Is there a reason you can’t go straight up? Or at least have a minimal offset?

 

[RobbieB]

The hypotenuse is twice the length of the horizontal "run", not the rise.

 

[webby3650]

Ya... science aside. My question is why? Is there an obstacle?

 

[O Never Done]

Thanks for the replies. The large offset is due to me wanting the stove approx. 9 ft away from vertical point chimney on top of house is at. The chimney pipe will come out of my house directly in the center of the house, I want the stove 9 ft away from that point in my living room for more viewing pleasure mostly.

It looks like it is a no-go. and live with a stove directly under chimney and go straight up.

I guess I have to break out the Sin Cosine and Tangent charts. to figure max run for 8 ft rise.

Thanks again.

 

[O Never Done]

I was able to calculate......Tangent=Opposite / Adjacent.... Tangent of 30 degrees = 0.58 , so for every 1 ft of rise on a 30 degree elbow slope setup, you will get .58 ft of run, and your diagonal/hyptonuse is 1 ft , on this 30-60-90.

So for 8 ft of headroom in attic the offset could be about 4.5 ft

 

[webby3650]

Each brand of pipe is a little different, and come with an offset chart that gives you rise and run. Many are available online.

 

[maple1]

I was able to calculate......Tangent=Opposite / Adjacent.... Tangent of 30 degrees = 0.58 , so for every 1 ft of rise on a 30 degree elbow slope setup, you will get .58 ft of run, and your diagonal/hyptonuse is 1 ft , on this 30-60-90.

So for 8 ft of headroom in attic the offset could be about 4.5 ft

Never mind, brain fart...