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Customer Q&A with Product Specialists
Brad
from Winnipeg Manitoba Canada asked:
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.
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.
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
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.
Showing 4 of
17 Questions and Answers
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About Chimney Pipe
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.
