pipe increaser clearance w/ pics

[ejwoodward]

Hello All,

Got rid of an old fisher stove because it was not even close to meeting the necessary clearances. Just bought a jotul f400 from a local dealer. Everything lines up just as it should except for the chimney increaser. I am using a double wall pipe all the way up to the support box where I am connected to a 6 to 8 inch increaser. The Jotul manual says I need 7 inches of clearance for a double wall pipe. The Selkirk stovepipe booklet says 6 inches to any combustible surface. The question is, is the 6 to 8 increaser that I am using really considered a double wall construction? As I was installing the pipe I noticed that the increaser, at its widest point, does not have a 1-inch air gap for air circulation. The dealer told me, for peace of mind, to install a small piece of metal in the 1 sqft area where I am not meeting 7 inches of clearance. Any thoughts would be greatly appreciated.

The red line in the first picture shows where the pipe is 6.5 inches from my cathedral ceiling

 

[G-rott]

I think I would have dropped the "box" if possible. If not a shield in that area should work. Is this going to be inspected by anyone, if so see what they require.

I think I would build a shield with a return that covered the "edge" of the ceiling cutout, and install it with an inch or so of airspace. Looks like a nice clean instillation, good job.

Happy burning,

Garett

 

[woodjack]

That's a tiny problem creating a big headache. I had a similar situation that I never completely resolved.
Do you know if they sell double-wall 8"-6" reducer? I never got a clear answer about that.
If they do that seems to be the easiest fix.

 

[moshiersr]

I hate to say it, but that is way too tight even with a shield.. If I remeber correctly a shielded single wall pipe still is supposed to be 8" from any combustible surface.. and 16" or 18" if it is not shielded..


The only way to get that to pass code is to drop the box I believe.. because IMHO the increase would be considered single wall pipe and you would have to follow the guidelines for single wall pipe..

Edit - Woodjack - do you think where it couples to the chimney connector would still be considered single wall even with a double wall reducer? I would think it is?

 

[woodjack]

Edit - Woodjack - do you think where it couples to the chimney connector would still be considered single wall even with a double wall reducer? I would think it is?

You're probably right about that. I don't know the answer. That would defeat the purpose of having double-wall pipe to reduce your clearance if you're using a reducer. . . .unless the inch or two of exposure at the joint is not considered enough exposure to transfer that much heat.

 

[ejwoodward]

thank you for the replies,

Yes, it would not make much sense to have a double wall pipe with an increaser that requires 18 inches of clearance. I went to the metalbestos web site and they have the adapter listed under the double wall pipe category and lists the category as having a 6 inch clearance. I will contact the tech department in the morning and see if they can clear the issue up for me. Will post a follow up once I know more.

 

[woodjack]

I recently called Selkirk customer service about a similar issue, connecting a 6" EXCEL brand double wall pipe to an 8" Metalasbestos chimney and could not get a straight answer. As I continued to ask questions to get a clear answer the woman quickly became impatient and rude. I hope you get better help than me. Good luck.

 

[ejwoodward]

Here is the update. I spoke with the metalbestos tech department and they told me that the increaser is approved for a 6 inch clearance. So, the question that I have now is, the jotul manual says I should have 7 inches with a double wall pipe and the pipe manufaturer says 6 inches. I am at 6 inches on the dot. It still has me a little concerned not to have a buffer. Any ideas on a remedy. I have some galvanized metal that I was going to cut and create a small area of shielding . Do you think that is necessary? Thanks for any info

 

[chad3]

I would think the stove guys know about their stoves and the pipe guys know about there pipes. Just how I would read it. If not, I'd love to hear how else one would go about figuring this out.
Chad

 

[begreen]

Here is the update. I spoke with the metalbestos tech department and they told me that the increaser is approved for a 6 inch clearance. So, the question that I have now is, the jotul manual says I should have 7 inches with a double wall pipe and the pipe manufaturer says 6 inches. I am at 6 inches on the dot. It still has me a little concerned not to have a buffer. Any ideas on a remedy. I have some galvanized metal that I was going to cut and create a small area of shielding . Do you think that is necessary? Thanks for any info

What is the installation? Straight wall or corner? At the stove the mfg manual clearances are the rule. Note that 7" is with the rear heat shield on the stove. If possible, I would exceed the mfg clearances by a few inches here.