Wood Stove Pipe

What is Stove Pipe?

A wood stove pipe moves exhaust fumes and particulates from your wood burning stove to the exterior of your home. Often called a chimney connector or black stove pipe, your can choose between single or double walled stove pipe to vent your wood stove. Either option can bridge the gap between your appliance and the chimney pipe system.

So, when is stove pipe needed? If you have a wood burning stove, you'll need stove pipe as well. It's just that simple. Most stoves do not come with stove vent pipe unless noted otherwise. You'll almost always need to buy the stovepipe separately.

Things to Consider Before You Buy Stove Pipe

Before you purchase stovepipe, you will need to learn which type of pipe works best for your stove and your home. There are two primary types of stovepipes - single wall and double wall stove pipe. There are different reasons for using one over the other, and we'll go over that in this next section.

In many instances, you'll often see or hear the terms stovepipe and chimney pipe used interchangeably. But, they are different products with different uses and should never be confused as the same product.

Stovepipe is only used inside the room where the stove is located. Stovepipe is designed to be run between the flue collar on the stove and the ceiling or outside wall. From that point, you'll need a class-A chimney pipe system to go through that wall or ceiling.

You'll also find occasional reference to triple wall stove pipe. However, this term is actually exclusive to chimney pipe and not related to the types of stovepipe available.

When deciding on which variety of stovepipe you need, here's one quick way to figure out the one that's right for you. Answer this question: With your stove installed, how close will your pipe be to a combustible wall? If you've got more than 18 inches of space, a single wall stovepipe will work for you. But, if your pipe will be closer than 18 inches to combustible material and you don't plan on installing wall protection, you need a double wall stove pipe. These only need 6 inches of clearance due to the air space between the walls in the flue pipe.

Top 5 Brands and Manufacturers

Many manufacturers out there offer their own brands of black stove pipe. So, how will you know which ones are worthy of your trust? We've got you covered! In this section, we feature some of the best brands in the industry for you.

• Heat-fab — A leading manufacturer of venting systems for more than 20 years, Heat-Fab makes most of their products in North America. Their stoves feature adjustable height constructions. They are made from 22-gauge steel with laser welded seams. All Heat-Fab products are compatible with each other and fit most decor. They also come in a variety of lengths and diameters to fit any installation.
• Imperial — Known for their single-walled, Snap-Lock stovepipe, Imperial transformed the industry. They pioneered technology to "snap" the seams of pipes together. Their connection system makes every seal easy to put together without sacrificing reliability. Snap-Lock comes in several diameters to fit your installation. They also have a great supply of reducers, couplers, and other parts to make installation easier.
• Duravent — With over 50 years experience, DuraVent makes some of the most dependable and long-lasting stovepipes out there. There are two kinds of Duravent pipe - DVL and Dura-Black. DVL is their double-wall stovepipe, and Dura-Black is the single-wall version. The pipes are made from 24-gauge steel with spot-welded seams. These stovepipes come in three lengths, and the black finish goes well with nearly any system. You can also connect any DVL to other DVL products; the same goes for Dura-Black products.
• Selkirk — Selkirk understands the cost of construction and maintenance. They make products that are dependable. With 90 years under their belt, they make stovepipes and produce all the accessories you need. Most of their pipes are double-wall varieties and come in both 6-inch and 8-inch diameters.
• Security — This Canadian company has been making chimney products for more than 50 years. They offer both single or double-wall pipes. They're made from 24-gauge steel and available in 6, 7, and 8-inch diameters. Most of Security's pipes come in black to blend with any home aesthetic.

Stove Pipe Varieties

When searching through brands, you'll find different classifications of pipes. There are snap-lock or snap-seam pipes, rolled-seam pipes, and continuously-welded pipes. Let's go over what all this technical information means.

Snap-Lock or Snap Seam — This kind of stovepipe ships in one flat sheet. The edges of the sheet are rolled together in the shape of a pipe and pushed until the pipe snaps in place. Modern snap-lock pipes work much better than older versions. They prevent all smoke leakage from the seams. This type of pipe is usually only available in painted black steel and is a 26 gauge thickness. For reference, the higher the gauge number, the thinner the metal.

Seamed Pipe — Many consider the rolled-seam pipe a step up from the snap lock. This pipe does not come in a flat sheet; instead, it comes fully assembled and ready to install. The pipe is 22 or 24-gauge steel. Its name hints to the way it's manufactured. The seam is machine-rolled to create a very tight and secure connection.

Some manufacturers also clinch or tack-weld the seam for longevity. This is a significant advantage of the rolled-pipe system. It even has flared ends which make for a smooth and tight connection that doesn't need sealant. This type of pipe is available in both black painted steel and stainless steel varieties.

Continuously-Welded Pipe — This vent system will give you the longest-lasting pipe but at the highest cost. It's also not very common. It's made from 22 or 24-gauge steel on a pipe that has no visible seam. The pipe is TIG welded. And, it's available in both manufacturer-specific and non-manufacturer-specific varieties. Continuously-welded pipes are most common in a stainless steel finish.

Double-Wall Stovepipe — Like the name suggests, this pipe has two walls - an inner wall and an outer wall. The inner wall of a double-wall pipe is made of 304 or 430-grade stainless steel with either a rolled or welded seam.

Insulating air space fills the gap between it and the outer wall. This type of stovepipe is larger in diameter than the single-wall type for obvious reasons. It has two pipes instead of one. Because of this, the dimensions can be misleading.

For example, single-wall stovepipes with an advertised 6-inch diameter have a true inner or outer diameter of 6 inches. But, a double-wall pipe with a 6-inch inner diameter does not include the dimensions of the outer wall. This means it will likely be 7 inches or more in diameter overall when accounting for the outer wall.

The outer wall consists of 24 or 26-gauge galvanized steel. The inner and outer walls connect with a fixed collar that is pressed and riveted to the ends. This fixed collar has evenly spaced air holes that allow for cooling air to move freely along the entire system length. Double-wall stovepipes do cost more than single-wall pipes, but with the right care, they can last a lifetime.

How To Install Wood Stove Pipe

If installing a stovepipe system yourself, you'll need some essential parts to create a proper connection. It depends on the way you plan to vent the exhaust, of course. For a vertical installation, place the stove in a spot where the pipe will maintain the proper clearance to combustibles. If impossible, you'll need a noncombustible wall shield for safety.

Please note that modern designs of vertical stove piping systems assume the chimney is already in position. So, from here on, we'll assume you have an existing chimney.

Now, let's take a look at what components you'll need to make a functional link between the stove and chimney.

Vertical Installation Components

Vertical installations are relatively straightforward compared to horizontal installations. A marginally assembled vertical joint of a stovepipe is not likely to leak. But, this is not the case for horizontal installations.

Horizontal connections must be tight and square to prevent condensation drips. With horizontal installations, there is a greater chance of you placing the stovepipe too close to a combustible surface. To avoid a dangerous situation, be sure to measure for proper clearances carefully.

Appliance Adapter — Also known as a stove adapter, this little connector attaches to the flue collar of the stove. It has a crimped and tapered bottom that holds it in place when inserted into the stove collar. You use these adapters for pipes that are unable to connect to the stove directly due to slight diameter differences.

A good example is rolled and welded-seam stovepipes. These products do not connect directly to the stove. Because of this, you'll need an appliance adapter to compensate for the size variances.

Appliance Adapter Damper Section — It's much like the appliance adapter just mentioned, but it has a damper. A damper helps regulate the flow of the flue gases inside the pipe. This type of adapter is essential for wood stoves built prior to Tier 1 EPA standards, meaning that they use ceramic baffles or a catalytic combustor in place of a damper.

Older wood burning stoves do not have an internal damper or baffle. Instead, they rely on an external damper to control the stove burn rate.

Piping — Rigid lengths of pipe make up the majority of the venting you will run. We recommend you get the longest length available from the manufacturer. The goal is to avoid having to make so many connections, which is time-consuming and leaves more chances for smoke leaks during a downdraft of blockage.

You must secure each connection with self-tapping sheet metal screws. Most manufacturers recommend a total of 3 #12 stainless steel screws at each connection. This will ensure a secure fit and a rigid pipe system.

Elbows — Elbows are angled piping components that allow you to maneuver the venting system. Some installations will require an elbow to align the pipe with the chimney system. Elbows come in handy if you have an HVAC duct or a framing member that you can't move. They also help if you need to adjust the location of your stove.

Do not use 90-degree elbows in a vertical installation. Instead, use a pair of 45-degree elbows to jog the pipe into position. You may also find that a short length of pipe can be used between the elbows to gain additional offset if needed. While they are convenient, try to avoid using an elbow if possible, as each elbow added restricts flow.

Telescopic Lengths — Telescopic lengths offer an extended piece of piping needed to cover shorter distances. They operate much like the collapsible body of a portable telescope - hence the name. Put plainly, telescopic lengths consist of two pipes, one fitting inside the other.

Both pipes are rigid, but the inner pipe has a slightly smaller diameter than the outer pipe. This allows you to extend the length of a pipe without the need to cut other piping. These operate much like a telescope, extending and collapsing. The extra length helps you connect the pipes to the chimney support or chimney collar.

Telescopic lengths are only available for rolled and welded-seam pipes. Double wall stove pipe relies on telescopic lengths to complete the installation. This help make the final connection between the stovepipe and the chimney pipe.

Slip Connector — A slip connector is the most common way to connect a single-wall stovepipe to a chimney system. This short section of pipe fits inside the end of the stovepipe you plan to connect to the chimney. Make sure you position the slip connector before installing the stovepipe itself.

The cylinder-shaped adapter or connector on the pipe "slips" upward and over a seam. Secure it in place to the seam using screws before connecting it to a ceiling support or chimney adapter. You cannot use slip connectors with double-walled stovepipes.

Size Adapters — Some manufacturers offer size adapters that allow you to alter the size of your stovepipe system. A good example of when you would need one of these is if your new stove has a 6-inch flue collar but needs to connect to an 8-inch chimney system. We recommend you use size adapters as a last resort because they can reduce the efficiency of the stove.

Modern stoves function best with chimney systems that match their flue collar diameter. So, if you resize your system, you'll need to install an adapter as close to the end of the stovepipe run as possible.

Chimney Adapters — These adapters are only needed for double-wall stovepipe systems. This component makes the final connection between the last section of stovepipe and the chimney support box or collar.

Chimney adapters come with a sizing ring. This piece connects to a beauty ring attached to the chimney support box. This makes the connection more aesthetically appealing.

Horizontal Installation Components

Elbows — You'll recall how 90-degree elbows aren't allowed for vertical installations. Yet, they are essential in horizontal installations. Most stoves feature a top-mounted flue collar. You will need a 90-degree elbow to redirect the vertical run of your stovepipe toward a wall.

Here's another point worth noting. Unless stated by the manufacturer, make sure you clear at least 12 inches of vertical piping from the stove before installing an elbow. This length allows the stove to establish draft before being restricted by the elbow.

Tees — These are specially designed fittings that look like the letter "T." Their shape facilitates the connection to a rear-venting stove or appliance. You can also use tees in place of a 90-degree elbow for installs that have a horizontal flue collar that then directs to a vertical stovepipe run. The base of the tee will feature a removable cover called a cleanout. The cleanout allows access to the stove pipe for soot removal with a chimney brush system.

Wall and Chimney Thimbles — For those looking to run your horizontal stovepipe through a wall or into a masonry chimney, you'll need a wall or chimney thimble. A chimney thimble is a sleeve and trim collar that passes the stovepipe into a clay chimney thimble, which then connects to a vertical flue within the masonry chimney.

Check with your local code enforcement agency beforehand if you need to pass a stovepipe through a combustible wall. Not all areas allow such a practice. However, if there's a combustible wall built over a masonry chimney, an insulated stovepipe thimble is usually allowed to pass the stovepipe into the masonry chimney.

Helpful Installation Guidelines to Follow

As you install your stovepipe, you'll need to follow some basic rules. While some installations are specific to a brand or a particular kind of run, there are some general guidelines worthy of you remembering.

• Be sure you always use furnace cement when attaching an appliance adapter to the stove. This cement keeps gases from leaking around the flue collar. If the stove allows for it, use screws to secure the adapter.
• Do not cut the stovepipe sections unless the manufacturer guidelines allow it. Some time ago, it was common to cut stovepipe, but it is not common practice anymore. Welded-seam and rolled-seam systems have slip connectors sections to accommodate odd lengths. If you were to cut the pipe, you would remove the specially designed flared ends and create an unsafe installation. The only stovepipe systems acceptable to cut are snap-lock and snap-seam. Even for these, the cut ends have to be crimped again for proper fitting.
• Install snap-lock and snap-seam pipes with the male end down. By doing this, you can funnel all the creosote and condensation into the stove to be burned off. Installing either pipe system male end up will cause fluid leaks that will stain the outside of the pipe. Welded and rolled-seam systems should be installed the same way. Some double-wall stovepipe systems follow different configurations. However, most systems have labels with proper orientation.
• Use self-tapping screws at each junction. It's recommended to use three screws spaced evenly around the perimeter of the joint. You can hide the screws with high-temperature black paint or use stainless steel fasteners with stainless steel pipes.

Shipping

If you purchase a few sections of stovepipe, it will ship parcel. If you're buying enough to complete an entire system, it will usually ship out via freight on a pallet. Shipping freight will help prevent damage. It also keeps the shipment wrapped properly in an upright position.

How To Clean Stove Pipe and Extend Its Lifespan

Maximizing the life of your stovepipe will take some work. If possible, burn well-seasoned, mid to high-density wood only. Hot, controlled fires produce less creosote buildup. But, still inspect the inside of your flue pipe once a month during the burn season. To clean your stovepipe, you can use one of two approaches – the top-down method or bottom-up method.

Before attempting to clean, it's always a good idea to inspect your stove pipe to assess the level of build-up. You can do this by collapsing the slip connector or telescopic section of the stovepipe and inspecting it with a flashlight.

If you can, do a top-down inspection from the chimney termination. This check will help you catch any debris that might have built up over time. When doing this, you can clean the system by removing the chimney cap. Make sure you have the right size poly brush. If you have any tee caps, stove catalysts, or baffles, remove them to keep cleanup simple.

Do not burn trash in your wood stove. Junk mail and plastic release dangerous chemicals and can coat your stove pipe with gunk.

Do not burn painted or chemically-treated wood. The fumes they release can be harmful and sometimes even deadly.

Use a chimney-cleaning log, especially if you haven't inspected the inside of your stove pipe. These logs make cleaning the pipe out a little easier.

When in doubt, hire a professional chimney sweep. If you're unsure of your abilities or don't have the time to clean your pipes properly, don't do it. But, the last thing you should do is let your pipes go a season without inspection. Hire a chimney sweep and give yourself peace of mind.

Summary

For more information, check out our DIY Fireplace Maintenance Guide. It covers everything you need to know about cleaning and maintaining your fireplace and hearth. If you prefer to talk to someone directly, our NFI certified technicians would love to assist you.

There you have it! Hopefully, you feel equipped to find and maintain your stovepipe and parts for your wood burning stove.

24 Questions & 24 Answers

Ask a Question

Gretchen F

from Mississippi asked:

February 15, 2021

What is the piece called that carries the stove pipe through the wall to the outside?

1 Answer

A thimble is the conduit to pass chimney pipe through a combustible wall to outside or stovepipe through a masonry chimney into the existing flue.

Submitted by: Tyler M. - NFI Master Hearth Professional on February 16, 2021

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Rodger D

from Joshua Tree, CA asked:

December 6, 2020

Will 6“ double wall connect to 6” single wall?

1 Answer

Single wall stovepipe is not designed to match up to double-wall stovepipe.

Submitted by: Aaron D. on December 8, 2020

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Orlan

from Iowa asked:

November 24, 2020

Can DuraVent 6" double wall stove pipe be enclosed in a chimney chase?

1 Answer

No. 

Submitted by: Will M. on November 25, 2020

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Steve

from Mio, MI asked:

June 4, 2020

If I use a telescoping stove pipe, would I be able to collapse the pipe inside the house for cleaning matainance?

1 Answer

Yes.

Submitted by: Owen O. on June 4, 2020

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Phil

from Livonia, MI asked:

May 6, 2020

What is the difference between snap-lock and dura-black 7' stove pipe?

1 Answer

The snap lock pipe has to be put together whereas the DuraBlack has a seam lock and doesn't require you to put it together. 

Submitted by: Kathy O. on May 7, 2020

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Gerry

from Utah asked:

April 19, 2020

How long should the stovepipe extend past the roof for proper exhaust flow?

1 Answer

Please note that stovepipe should never extend above the roof because a transition from stovepipe to solid insulated class A chimney would be required via a ceiling support box for the class A chimney to extend from this point and beyond the roof line. The class A would then need to satisfy the 3-2-10 rule which states that the chimney must extend a minimum of 3' above the highest point of the roof it passes and also clear any obstruction within a 10' radius by 2'. 

Submitted by: Will M. on April 21, 2020

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Tom L.

from Boston, MA asked:

February 26, 2020

Have a tiny woodstove with a 4" flue by apple Pi (Ekol stoves).  it has a hard metal flange on the stove at 4-1/4" and I need everything to pipe it from the stove to a 6" metal insulated roof panel. Do you have anything?

1 Answer

We do not carry any 4-inch inside diameter class A pipe, which is what would be needed for a wood stove. We apologize for the inconvenience.

Submitted by: Tyler M. - NFI Master Hearth Professional on February 26, 2020

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Muggy

from New York asked:

February 9, 2020

I would like to install another wooden stove on the first floor directly below the first one. Can I join them as a single pipe so I don't have a double pipe exiting the roof and no holes or extensions?

1 Answer

No, individual wood stoves will each require their own chimneys, so the pipes cannot be combined.

Submitted by: Tyler M. - NFI Master Hearth Professional on February 10, 2020

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Vince R.

from Monte Vista, CO asked:

January 9, 2020

I want to install a wood stove vertically, but I have a metal roof. My question is whether I could install the pipe above the roof with a high-temperature Dektite Pipe Flashing Boot. I just don't know what temperature the stove pipe wood be on the outer wall of the pipe? 

1 Answer

The temperatures advertised for this product are merely stating the surface temperatures the product can withstand when the stovepipe and chimney are installed properly. Since the product would only come in contact with the outer surface of a class A chimney pipe exposed above the roof, the outer surface temperature will never come close to reaching 392 degrees F.  Solid-insulated class A chimney will commonly have a 1" thick layer of insulation between the inner and outer walls to keep inner flue temperatures hot while keeping outer surfaces cool enough to come within 2" of combustibles without issue. To put this in perspective, the outer surface temperatures of a single wall black stovepipe section with no insulation should ideally be between 250-450 degrees when taken with a surface thermometer located 12 inches above the stove. 

Submitted by: Will M. on January 9, 2020

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Mike

from Mitchell, IN asked:

December 13, 2019

I have a Lopi Berkshire gas stove. Inside the pipe is 4 inches, and outside is 6 1/2 inches. I'm taking the Lopi Berkshire stove out and replacing it with a Napoleon Haliburton and the inside pipe size is also 4 inches, but the outside is 7 inches there's 1/2 inch difference in the stove pipe. Can I get an adapter for the top of the Napoleon stove which is 7 inches adapt to my existing pipe which is 6 1/2 inches or not?

1 Answer

The Napoleon stove offers an adaptor that converts the 4" x 7" flue to a 4" x 6 5/8" flue for use with the 46DVA DuraVent DirectVent Pro pipe. We would recommend that you check to see if the pipe you had in place for the Lopi model may be this brand. If not, the pipe will need to be replaced.

Submitted by: Tyler M. - NFI Master Hearth Professional on December 13, 2019

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Joe

from Tucson, AZ asked:

November 20, 2019

I have an oval flu collar on an old wood stove. I'm not seeing anywhere that the stove pipe has to fit inside it. Does it need to be crimped and go inside the collar?

1 Answer

As is the case with most older wood stoves, you will likely need to have an oval-to-round adaptor piece custom made to the specific size you need. 

Submitted by: Tyler M. - NFI Master Hearth Professional on November 20, 2019

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Dave

October 23, 2019

8" flue ( teracota pipe)  wall thimble to 6" black stove pipe adapter

1 Answer

If you are breaching into a masonry chimney through a wall, you could use the Heat-Fab Insulated Saf-T Thimble.

Submitted by: Cortney O. on October 24, 2019

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Eric

from Baton Rouge La. asked:

August 19, 2018

I have a house built in the 70's the chimney pipe is in need of replacing it has an I.d.of 9" and an o.d.of 11" with twist lock can you help?

1 Answer

Class "A" chimney pipe has to match the exact brand/model and can not be mixed.

Submitted by: Owen O. on August 20, 2018

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Nefertiti F

from Paintsville Ky asked:

January 28, 2018

I wanted to know which tee I need to be able to get ventilation to my stove without taking my pipes out the roof???

1 Answer

To vent out a wall you would need more than just the tee.

Submitted by: Owen on January 29, 2018

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Maggie B

from Nashville, TN asked:

January 24, 2018

Hello! We are renovating and restoring a beautiful MCM home here in Nashville. We want to lower the tiled platform base you can see in the photo and create a hearth that is inlaid into the floor. Now we need an extension piece to make that work-- we are looking for the pipe part of the chimney of our Malm Fireplace. We are looking for just a 10-15" extension piece-just the cylindrical column. Do you have parts that specifically work with the Malm? Also, likely the correct paint to ensure the fireplace is up to its heat-resistant former self.

1 Answer

Unfortunately, we do not carry any parts that work specifically with a Malm. I apologize for any inconvenience.

Submitted by: eFireplaceStore.com on January 25, 2018

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Gerry

from Colorado Springs asked:

December 13, 2017

How are duravent products attached to each other?

1 Answer

The wood burning Duravent Class A Chimney connects with twist locking ends at the top and bottom of each pipe.

Submitted by: Brennan W. on December 14, 2017

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victor

from Randolph, MA asked:

November 23, 2017

Hello. I have a franklin federal wood stove with a 5 1/2" inside diameter flue opening(stove top). Can I get a stovetop adapter for this to allow me to use a duravent pipe system..6"?

1 Answer

You will have to custom fabricate an adapter for this if one is not supplied by the manufacturer.

Submitted by: Kelsey C. on November 24, 2017

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Kevin

from CA asked:

October 11, 2017

I have a 6" telescoping double wall stove pipe, which is stuck. Do you have any suggestions to "un-stick" it and extend the pipe back into position? Thank you.

1 Answer

Standard dish soap should do the trick

Submitted by: Owen on October 12, 2017

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Peter

from Arundel, ME asked:

October 4, 2017

I have an older kitchen cook stove with an oval flue opening at the stove body that continues through the oval opening in the rear back shelf/shield. It looks to be 6 inches; is there a stovepipe that stays oval for a specified length (24"), then adapts to double wall 6 inch pipe? Thank you.

1 Answer

Unfortunately, we do not carry stove pipe that stays ovalized for a length before rounding. This is something you're likely going to need to have custom fabricated by a local metalworker.

Submitted by: Brennan W. on October 4, 2017

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Anthony

from Grand Junction, IA asked:

May 15, 2017

I bought an old small #8 laundry stove. It has an oval flue pipe hole, 3.5 x 7.5 inches. I was looking for an oval to round adaptor . I see you have a 4 x 8 to 6" in stock. Could it be as simple as squeezing a 6 inch pipe at the bottom to oval slide it onto the flange ? Or, would a 4 x 8 with fire-proof material packed around the flange work (a ceramic type filler)?

1 Answer

We will not offer any oval to round adapters with these measurements and do not have the ability to have this custom fabricated, however, a local metal fabricator will likely be able to have this made. The other option would be to locally source a straight section of black stovepipe and field-ovalize your adapter.

Submitted by: Will M. on May 16, 2017

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Dan Noye

from Williamsburg, PA asked:

November 29, 2016

I'm looking for a flue pipe adapter. It is oblong, not oval: 8 3/4" x 4 1/2" It fits a U.S. Cannon Heater # 18 B.

1 Answer

We do not offer this adaptor, so my recommendation will be to have this adaptor fabricated locally.

Submitted by: Will M. on November 29, 2016

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Jaimen

from Saskatchewan asked:

November 15, 2016

Do you a sell 3" stove pipe?

1 Answer

Unfortunately, we do not offer 3" stovepipe and are unaware of any vendor offering 3" stovepipe.

Submitted by: Will M. on November 15, 2016

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Lucy

from Durham, NC asked:

October 17, 2016

Do you have any triple-lined pipes?

1 Answer

We do sell some triple wall chimney systems.

Submitted by: eFireplaceStore on October 18, 2016

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Ozzie

from California asked:

January 9, 2014

When you transition over from 6'' single pipe from a support box to double wall pipe, what is the diameter of pipe going through the roof using a Duravent system?

1 Answer

If you transition to DuraTech chimney pipe (double wall), the outer diameter would be 8 inches. If you transition to DuraPlus (triple wall), the outer diameter would be 10 inches. Either system will work the same and have the same clearances, but some municipalities require the use of triple walled chimney pipe. Duraplus would be the product to use in that case.

Submitted by: Collin C. - NFI Master Hearth Professional on January 9, 2014

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