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Figuring out what kind of piping you need to install your fireplace, stove, or other hearth appliance can be intimidating. To simplify things, we will examine several aspects of the most common types of chimney pipe and explain their uses and applications.
We plan to help you familiarize yourself with chimney and stove pipe. First and foremost, in any installation, you'll want to consult the owner's manual for your hearth appliance. Different fireplaces and stoves have varying venting requirements. These requirements involve more than just the kind of pipe you need, like the DuraVent chimney pipe; they also include specific information regarding clearances and offsets that require following for safe and proper installation. If anything in your manual is unclear or confusing, contact the manufacturer of your appliance directly for clarification.
But if you need further assistance reaching your manufacturer, please call us at 800.203.1642. Our NFI-certified specialists will be happy to help you in any way they can.
With over 13 years in the industry, Collin is a National Fireplace Institute (NFI) certified technician and managed content for the eFireplacestore and eCanopy brands. He has achieved the highest NFI certification possible as a Master Hearth Professional and is certified in all three hearth appliance fields: wood, gas, and pellet. With experience with sales and in-field installations, his expertise shines through his technical knowledge and way with words.
I had to remove my brick chimney and still want to connect my wood fireplace. What size and type of pipe should I use?
Depending on the condition of the remaining chimney structure, a Class A chimney system might be adaptable. However, it's crucial to have this inspected to determine the necessary repairs. You can contact a local CSIA certified chimney professional to assess the chimney's condition and required repairs. You can find a local professional here: CSIA Find a Chimney Sweep.
Answered by:
Aaron D.
on Feb 24, 2026
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Ted H. from Cody, Wyoming asked:
Does my double-wall pipe coming from the top of the woodstove go on the inside or the outside of the flue extension at the bottom of the square support box?
This should be installed outside of the collar on the support box.
Answered by:
Devon P.
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Dennis B. asked:
I need to extend the portion of the the chimney above the roof. Currently, it is only approx 2' above the roof. The existing chimney is double wall with a chimney cap. Do I have to continue with double wall or can I use the much less exp
Yes, by code, the same brand/model of chimney pipe must be used to extend your chimney.
Answered by:
Tyler M. - NFI Master Hearth Professional
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Bill from Charlotte NC asked:
Can you use a flexible pipe on a direct vent gas fireplace rather than cut a stud? It is about a 3'' offset and will allow me to center the fireplace between two wall cabinets. Is this safe?
This will depend on the specific model. Some direct vent gas fireplaces can utilize a flexible vent pipe, but others cannot. This information will be stated clearly in the installation manual.
Answered by:
Tyler M. - NFI Master Hearth Professional
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Bob M. from St. Paul, Minnesota asked:
I am replacing an existing stove that has an 8" stove pipe through to the roof. The new stove has a 6" outlet, thus sized for a 6" stove pipe. Can I install an adaptor that goes from 6" to 8" to avert changing everything on the roof?
We do offer 6" to 8" stove pipe adapters that increase stove pipe size before connecting to class a chimney.
Answered by:
Jason W.
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Ben A. from CORONA, CALIF. 92882 asked:
Can an existing masonry chimney with a clay flue liner be raised using a metal adapter and triple wall pipe to the required height?
Yes, you can use an anchor plate to transition a functional masonry chimney to a manufactured, stainless steel class A chimney system. The diameter of the pipe needed will depend on the inside flue dimensions of the existing chimney.
Answered by:
Tyler M. - NFI Master Hearth Professional
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Will from Sarnia ontario asked:
Is it okay to run double-wall stainless from stove to exit with rain cap three roof in a shop?
The chimney will need to be a Class A chimney system to go through the roof and the outside of the shop.
Answered by:
Aaron D.
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Angel O. from New Britain Ct asked:
I bought the thimble to go thru the wall, but the wall width is much less than the thimble width. Is it acceptable to reduce the width of the thimble using a tin cutter to match the width of the wall?
Assuming the thimble is only a conduit for a pass through, and not a connected part/adaptor for the pipe itself, yes, this can be done.
Answered by:
Tyler M. - NFI Master Hearth Professional
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Mike E. from Talmoon,Mn asked:
How does a 6-inch black slide pipe attach to the bottom of class A chimney pipe?
To attach to the Class A chimney, you will usually require an adapter or finishing collar.
Answered by:
Brennan W.
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Michael E. from Baltimore, MD asked:
How long (years) should a Class-A chimney pipe system last? A local contractor has told me 20 years.
20 years for class A pipe is a fairly conservative estimate for lifespan, but that certainly holds true for some applications.
Answered by:
Tyler M. - NFI Master Hearth Professional
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Steve from Pasadena nl asked:
Can I use pellet venting for an oil-burning stove?
No, you could not. By code oil burning units require Class "A" pipe.
Answered by:
Owen O.
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Camille L. from 11792 asked:
When installing a stainless steel 6-inch liner in a masonry chimney can you use a 6-inch to 5-inch adapter and continue on down with the 5-inch stainless steel insert to the tea?
The appliance you are installing will dictate the diameter of your vent system. Most wood inserts require a 6" diameter stainless steel liner that cannot be reduced in size.
Answered by:
Brian L.
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Jeanine S. from melville Ny asked:
Can a full exterior masonry chimney stack be removed and replaced with a metal chimney?
Yes, this can be done with an anchor plate and properly-sized class A solid-pack stainless steel chimney.
Answered by:
Tyler M. - NFI Master Hearth Professional
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Hyvis from Creston, ia asked:
Do I need an adapter to go from double insulated pipe to a triple?
You can't go from double insulated chimney pipe to triple insulated chimney pipe. Once you pick a brand and a size you have to stay with that for the entire install. Adapters are required to go from the black stove pipe to the chimney components. Most brands have adapters that are sold separately. Â
Answered by:
Kathy O.
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Arthur A. from HHEBER, UTAH 84032 asked:
Can I vent a 80,000 BTU garage furnace flue (4" diameter, lp) into an existing 8" wood burning stove flue (single wall) prior to going through the attic's class-A flue?
We do not recommend changing the diameter on your furnace. It is best to use the appropriate pipe as listed by the manufacturer for the specific model you are venting. Such a change in flue diameter can lead to issues with proper draft and flow, impacting the performance of the furnace.
Answered by:
Tyler M. - NFI Master Hearth Professional
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David from Meaford Ontario asked:
I have a fireplace insert I want to put into a brick fireplace. Just wondering what kind of pipe I need if it's going up a brick chimney that is 16" square with a 6" hole on top of the insert and chimney?
Most woodburning fireplace inserts require a 6" diameter stainless steel chimney liner.
Answered by:
Tyler M. - NFI Master Hearth Professional
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Pat D. asked:
Can a 3 or 4-inch pellet stove pipe be used for a small coal stove the size of a milk crate?
We're sorry, but no, pellet pipe is not rated for coal or wood units.
Answered by:
Owen O.
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Geoff asked:
How do you figure out what degree elbow is needed when installing a Duravent 6'' walled woodstove pipe?
Thank you for your interest in our products. We've received your question and will get back to you shortly — usually within the hour but always within 1 business day. To ensure you receive our response, please add our email address (info@efireplacestore.com) to your email whitelist or address book.
In the meantime, while we prepare our response, keep an eye on your inbox for an email from us. We'll be sending you our exclusive Buyer's Guide, packed with valuable information to assist you in making the best decision for your needs.
If you have any further questions or need immediate assistance, feel free to reach out to us directly at 1-800-203-1642.
