By Kevin from Castle Rock, CO on August 4, 2013
It is recommended that the chimney pipe extend at least 3 feet above any obstruction within 10 feet of the pipe. Does this include the roof itself? I have a 7.5/12 pitch roof, and that would require the pipe to extend 9.5 feet above the roof. I have no other obstructions anywhere near the roof of the house. I don't want any draft issues, but also don't want to extend the pipe higher than necessary.
By Tyler M. - NFI Certified Specialist on August 5, 2013
If the pipe is penetrating your roof more than 10 feet away from the peak, then you will need 8'3" of pipe above your roof line. This height will require the use of an extended roof support, which we sell with all the DuraPlus and DuraTech class A pipe. Please let us know if you need a full quote, which you can get by filling out our Chimney Pipe Design & Quote Form
By Susan from West Augusta, VA on October 19, 2015
I am thinking of using a 24 inch chimney pipe below the support box as well as a 36 inch pipe above. I see that the support box has an attachment for the upper pipe, but how does the lower pipe connect to the support box / upper pipe?
By eFireplaceStore on October 20, 2015
Answer:Ceiling support boxes are designed as a transition point between Class A chimney and black stovepipe. Black single or double walled stovepipe is designed to be run up to the bottom attachment on the support box and then the Class A chimney pipe will attach to the top side of the component.
By Steven from Elma, New York on February 26, 2014
I have some triple wall chimney pipe that each section is approximately 36" long with a 6" inner diameter and a 7.5" outer diameter. I need an elbow that will attach on the one end. I am using it to vent my pizza oven that I have built into a 13" by 13" clay flue. The triple wall pipe that I have says "Made in China" but no other markings. The one end in the picture attached shows that the previous owner must have screwed a flange on to the end for modification. Any idea on what parts I should get because I just have straight pieces ?
By Collin C. - NFI Master Hearth Professional on February 27, 2014
Answer:Unfortunately, we are unlikely to carry any parts to fit this particular chimney system. From what I can see in the photo, this actually looks like a double wall chimney system, but the attachment hems on the male end do not look like anything that we carry. The chimney products we offer are all U.S. made, which confirms further that our products will not fit. I apologize that we do not offer components for your needs.
By Phillip from PA on August 27, 2013
Do you have to use a support box in the ceiling if you use a support bracket?
By Tyler M. - NFI Certified Specialist on August 27, 2013
Answer:Please specify what is meant by "support bracket." Do you have a part number or can you briefly describe your installation? Generally, a ceiling support is required unless another primary support piece is used, such as a roof support (mounted around the pipe under the roof flashing). We look forward to advising further upon your response.
By Mark on November 9, 2012
What's the difference between Duratech, Durapro, and the other class A pipe systems? I'm putting in a 16 foot chimney on a wood burning stove.
What's the most economical class A pipe?
How serious an issue is the drafting problem?
on November 9, 2012
Answer:Simpson Duravent's main Class A product lines are Duratech and Duraplus. Duratech is a double walled product that has 2" of difference between the inner and outer walls and is insulated with a blanket of ceramic fiber. Duraplus is a triple walled product that has a 4" difference between the inner and outer walls. There is a layer of ceramic fiber between the inner and middle wall, then an air space between the middle and outer wall.
Foot for foot, Duratech is a bit less costly. However, your application will determine the pipe that is needed best. If the chimney pipe will be exposed to the outdoors, rather than encased in a wooden chimney surround, triple wall piping will be the better choice. The only exception to this will be if you are in a warmer climate. Double wall piping can suffice in the southern states, because it will not get cold enough to cause drafting issues. Given the fact that the total of your vent piping will be located outdoors and your location in Colorado, I would definitely recommend using the triple wall product. If you were located in a warmer area, use of double wall piping may cause only intermittent drafting issues. However, I fear the cold would cause ongoing problems for your installation. The chimney would likely get cold enough that the stove would be very difficult to start. On the occasions that the fire would burn, it would likely not perform as well as it should, due to the lack of a good draft.
If you do decide to utilize the double wall piping, I strongly recommend constructing a wooden chimney chase around the piping to help keep it warmer.
By Tony from Michigan on October 6, 2013
What transition part do I need to connect stainless steel double walled pipes to a single wall black stove? I want black pipe up to my ceiling, then I want a transition firebox to attach my 6" black pipe to SS double walled outdoor pipe.
By Collin C. - NFI Master Hearth Professional on October 7, 2013
Typically, a ceiling support box or round ceiling support is used to make this sort of transition. The support serves a dual purpose in the fact that it supports the chimney above the ceiling and allows a safe transition point. An item such as the DuraPlus All-Fuel Chimney Round Ceiling Support
is a good example of a support for a flat ceiling, while a pitched ceiling is better served by an item such as the DuraPlus All-Fuel Square Cathedral Ceiling Support Box
. If you have already selected the brand of chimney pipe you wish to use, please advise and I will assist you in selecting the proper components. Each pipe brand has different attachment methods and components, so it is important to use the same brand of parts.