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I tried to remove some old vent pipes that went into my basement. White, sandy material came out from the vent pipe. Is this material harmful?
That material should just be a silica sand and is not harmful.
Answered by:
Aaron D.
Helpful?
20
Marc S. from Hendersonville NC asked:
Question: I have a MFG fire place with a veneer stone face and metal flue pipe. I want to put my wood stove in front of the fire place,go through the wall and connect my wood stove pipe into the existing metal flue pipe. Would there be any problem with do
If the existing pipe is a Class A pipe approved for venting a wood stove, you could do that but most factory-built fireplaces require you to vent using their specific pipe. If that is the case, then that pipe is not approved for venting a wood stove.
Answered by:
Kathy O.
Helpful?
10
Mickey M. from Beaverton Or asked:
I've converted my wood fireplace to gas to comply with NW Gas. The existing metal chimney, installed in 1983 when the house was built, is approximately 9 feet tall. I'm having the roof re-shingled soon and would like to update the gas chimney beforehand. Could you please provide some guidance?
Updating the venting for a converted gas appliance is a critical safety matter, and we cannot recommend specific parts without precise details about your installation. Venting requirements are dictated by the specific gas appliance and its manufacturer's installation manual, not solely by the existing pipe diameter or the presence of a metal chimney. In most cases, an existing wood-burning chimney cannot be directly used for a gas unit, so the correct components depend entirely on the gas appliance you currently have.
To provide you with safe and accurate advice, please reply with the following information:
- The make and model number of the gas appliance installed (e.g., gas insert, built-in gas fireplace, or gas log set).
- Whether the original fireplace is a site-built masonry (brick) fireplace or a prefabricated manufactured firebox.
- A brief description of the vent run, including the total height above the appliance, whether it terminates vertically through the roof, and the roof pitch.
In the meantime, please note two important safety points: If a dedicated gas unit was installed, the venting *must* match the components specified in its model's documentation. Typically, an older wood-burning chimney needs to be replaced with the vent system designed for the new gas unit. If you have a vent-free style gas log set, this type is only permitted in specific listed fireplaces. Since an improperly matched vent system can pose a risk of carbon monoxide, we need to confirm the exact model before recommending any parts.
You can explore different venting types in our guide, How to Choose the Right Venting for Your Fireplace, and browse available products on our Chimney Products page. Once we have your make and model details, we can verify the listed venting requirements for your unit and prepare an itemized estimate using our Chimney Pipe Quote Form.
Answered by:
Brennan W.
on Jul 19, 2026
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00
Robby B. from Temple, TX 76504, USA asked:
We need to move a chimney out of a valley to prevent water damming and roof leaks. Can we use a pair of 30 or 45-degree off-sets to reposition the chimney? Can you help us identify the corresponding pipes needed for this modification?
Hello,To achieve this, you will need the H9199 adapter, and then transition to our 8DM pipe. Here is a link to the 30-degree elbow kit: [30-degree elbow kit](https://www.efireplacestore.com/fsd-30e-8dm.html). We can certainly help you find the corresponding Superior 8DM pipe and the necessary 30-degree offset kits. Please let us know if you would like assistance in locating these components.
Answered by:
Kathy O.
on May 28, 2026
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Mike K. from East of New York city asked:
I have a Vermont Castings Acclaim stove in my basement that vents to a chimney approximately 34 feet high using 6-inch pipe. There have been no previous venting issues. During a recent chimney cleaning, about half a cup of sand was found. The chimney cleaner suggested the sand indicates deteriorating mortar joints, potentially due to a cracked liner from running the stove very hot. I'm considering installing a stainless steel liner – should it be double or single-walled? Are there specific brands recommended for Vermont Castings stoves, and what thickness should the liner be? The chimney has been in use for 20 years with no leaks, only this sand. Could the cleaner be exaggerating the issue to push a liner installation?
Hi Mike,
Thank you for reaching out regarding your Vermont Castings Acclaim stove and your chimney concerns. Please note that we are not a Vermont Castings dealer and cannot provide specific product recommendations or compatibility assurances for their stoves. However, we can guide you on stainless steel chimney liners for wood-burning appliances.
The presence of sand during a chimney cleaning could indicate deterioration of your masonry. A chimney liner is designed to protect the masonry from the damaging effects of flue gases and ensure safe, efficient venting. We recommend obtaining a second opinion from another certified chimney professional to confirm the diagnosis and the necessity of a liner, as we cannot provide an assessment of your chimney's condition or your cleaner's recommendations.
Regarding stainless steel liners, we offer options from DuraVent, a reputable brand for relining systems:
* **DuraLiner:** This is a high-temperature, insulated double-wall masonry relining system suitable for wood-burning appliances. It features a .016" 304 stainless steel inner liner for rigid pipe and .005" 304 alloy stainless steel construction for flexible pipe options. A key benefit of DuraLiner is its zero clearance rating between the liner and masonry, and masonry and combustibles, which can be crucial for high-heat wood-burning applications.
* **DuraFlex Stainless Steel (SS):** These are flexible stainless steel liners, available in single-wall options like the 316 and 304 types, which are economical and good for wood-burning appliances. The DuraFlex SW type is specifically ideal for wood and gas-burning units and has a smooth inner wall to reduce creosote buildup. The DuraFlex SS liners typically have a .006" metal thickness.
For your 6-inch pipe requirement, both single-wall DuraFlex SS and double-wall DuraLiner are available. The choice between a single or double-wall liner often depends on your specific installation requirements, clearances to combustibles within the chimney chase, and local building codes. An insulated double-wall liner like DuraLiner offers enhanced safety and performance, especially with 0" clearance to masonry and combustibles.
It is crucial to consult your Vermont Castings Acclaim stove's installation manual for any specific venting restrictions or requirements. Additionally, always follow local building codes and have your venting system inspected by a certified professional.
We have various 6-inch DuraVent stainless steel liners that could be suitable for your application. For example, we carry:
* DuraFlex SS Stainless Steel Chimney Liner - 6 inch x 20-ft. - 6DF316-20
* DuraFlex SS Stainless Steel Chimney Liner - 6 inch x 25-ft. - 6DF316-25
* DuraDuroVent DuraLiner 48 inch Round Rigid Reline Pipe - 6 inch Diameter - 6DLR-48
* DuraVent DuraLiner 36 inch Round Flex Reline Pipe - 6 inch Diameter - 6DLR-36F
To help us provide a more tailored recommendation and a quote, could you please confirm the exact model number of your Vermont Castings Acclaim stove? Also, please provide your shipping zip code so we can calculate pricing and lead times.
Answered by:
Tyler M.
on May 01, 2026
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00
Robert M. from Swan Lake, Montana asked:
What diameter should the female dimension of a steel coupling flange be to receive the male end of a 6 inch and/or an 8-inch stove pipe?
If you are referring to the flue connection on a wood stove, there is no general answer we would be able to provide. I will note, however, that most stovepipe manufacturers will offer a stovepipe to appliance adapter to provide the proper male end down connection by accounting for slight differences between the female stove flue connection and the male connection of the stovepipe.
Answered by:
Will M.
Helpful?
00
Dwayne R. from Winter Park FL asked:
I am looking for a 10 x 15 flue mount chimney cap. Where might I find that?
Stephen F. from Berkeley Springs, W.V. 25411 asked:
I need a super vent chimney pipe to reduce from 8" to 6". Where can I buy one?
Unfortunately, Supervent does not have an adapter to go from 8" - 6".
Answered by:
Aaron D.
Helpful?
00
Karl G. from Mont Vernon NH asked:
Do you sell a reducer for an insulated pipe from 7 inches to 6 inches?
No, our only such reducers are for the single-wall black stovepipe.
Answered by:
Tyler M. - NFI Master Hearth Professional
Helpful?
00
William R. from virginia asked:
Do you sell stainless steel chimney pipe?
Yes, we have several brands of chimney pipe. Some are used with specific units.
Answered by:
Kathy O.
Helpful?
00
Brent asked:
I want to remove an old fireplace and install a zero clearance fireplace. There is currently an 8" chimney/flue exiting the chase above the roof. Can a fireplace that requires a 6" flue be installed with a flexliner 6" inside the existing 8" pipe?
No, you will need to connect all-new pipe that is compatible with the new fireplace model, as this is the only way to get a proper, listed installation. The diameter/model of the chimney pipe needed will be determined by the model itself.
Answered by:
Tyler M. - NFI Master Hearth Professional
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00
Bruce F. from West Tisbury, Mass asked:
Do you sell a flue paint sealer?
No, we do not offer this product.
Answered by:
Will M.
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00
Glenn from Berlin NJ asked:
I have a 42" TemTex woodburning fireplace and need the flue pipe to install, do you have this?
No, we apologize, but we do not have any chimney parts for Temtex fireplaces.
Answered by:
Owen O.
Helpful?
00
Jeff from baldwin WI asked:
I am looking at the WRT4542 for my 1200 sq. ft. home. My question is, will the damper in the stove leak cold air when not fired? Also, will a vent kit do the same? Additionally, do I need a fresh air kit?
The WRT4542 fireplace has a fireplace built into the top of the unit and this will do a great job preventing too much cold air intrusion down the flue and into the house. You could also add glass doors to this unit to further mitigate any such cold air issues. There is no fresh air kit needed for the chimney, as the pipe itself is air-cooled with a 15-inch outside diameter pipe (it has a 12-3/8-inch inside diameter). We would recommend a fresh air kit to be connected to the side of the fireplace if it will be installed near an exterior wall or above crawlspace.
Answered by:
Tyler M. - NFI Master Hearth Professional
Helpful?
00
Milo from Camp Wood, TX asked:
My ceiling is 10 ft high. What do I need for support in the chase?
On the vertical rise within the chase, it is recommended to have wall straps for support every 8 feet.
Answered by:
Tyler M. - NFI Master Hearth Professional
Helpful?
00
Ron B. from Oroville,CA asked:
How do i get an airtight seal from my insert to chimney without installing pipe all the way up the existing brick chimney?
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Michael from Hickory, NC asked:
When using an oval liner, should the adapter be sized so that the liner fits over the adapter or inside of the adapter?
When using sleeves and adapters, the male end of the liner should always be facing back towards the unit. This allows condensation to run back inside of the appliance as opposed to down the exterior of the liner itself.
Answered by:
Chris
Helpful?
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Craig from Hamilton asked:
How long does a gas liner last?
While longevity will depend on the amount or humidity in the flue gases, the typical liner can last for 20 to 25 years under normal conditions. In extreme circumstances where high humidity is present, the life expectancy can be cut in half.
Answered by:
Collin C. - NFI Master Hearth Professional
Helpful?
00
Pete from Indianapolis, IN asked:
Should inner liner go inside outlet on box or should it be outside?
The general rule of thumb is for vent pipe to be installed male end down. So, the liner would go inside the flue outlet. Of course, most factory boxes require specific brands of pipe that feature locking tabs and ensure a proper fit/connection.
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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.
When installing a vented fireplace, the fireplace itself is only half of the equation. You've got the fireplace flue, the chimney pipe also called the flue pipe, and more to deal with. Every vented fireplace uses a specific type of chimney pipe or vent pipe to safely pass combustion gasses to the outdoors.
Spend any time looking at the plethora of venting products on the market and you may find your head spinning a bit. To cut down on the amount of confusion when it comes to fireplace flue pipe, we have created a handy buyer's guide that gives a step-by-step look at what vent system you need for each fireplace. Armed with the knowledge from this Chimney Pipe Buyers Guide, you are sure to find what you need.
