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DuraVent DuraFlex Stainless ProMesh Insulation Kit: a complete wrap for 3 to 6 inch liners
The DuraVent DuraFlex Stainless ProMesh Insulation Kit is an insulation package that wraps around the liner inside your chimney. It covers 25 feet of liner in 3 to 6 inch diameters. You get a 22 inch wide ProFoil blanket roll, 25 feet of protective ProMesh, and foil tape. For wood burning, a half inch of ProFoil lets the liner touch the masonry instead of needing 1 inch of air space. DuraFlex Stainless is DuraVent’s flexible stainless steel liner for relining a masonry chimney that vents a wood, pellet, oil, or gas appliance.
Gas, oil, and pellet liners can touch masonry without insulation. Insulating helps draft and reduces condensation, especially in cold, exposed chimneys. Have a chimney professional check the masonry’s clearance from house framing. Before lowering the liner, wrap it with ProFoil, tape the seam, and slide ProMesh over the blanket to protect it. The stainless band clamps for both ends are sold separately. Liners over 6 inches need wider blanket and larger mesh, purchased separately. Need the blanket alone? See DuraVent DuraFlex Stainless ProFoil insulation blanket. The DuraVent DuraFlex Stainless ProMesh Insulation Kit ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
Details
SKU: 6RNS-IK
Applications
- DuraFlex Pro ultra flexible relining for masonry chimney. Use with gas, wood pellet, oil, or wood appliances. Applications include: fireplace inserts, furnaces, boilers, and water heaters.
- DuraFlex SW smooth wall flexible relining for masonry chimney. Use with gas, wood pellet, oil, or wood appliances. Applications include: fireplace inserts, furnaces, boilers, and water heaters.
- DuraFlex 316 flexible relining for masonry chimney. Use with gas, wood pellet, oil, or wood appliance. Applications include: fireplace inserts, furnaces, boilers, and water heaters. 316 is designed for use in harsher conditions, for more resistance to corrosion, such as coal.
- DuraFlex 304 flexible relining for masonry chimney. Use with gas, wood pellet, oil, or wood appliances. Applications include: fireplace inserts, furnaces, boilers, and water heaters.
Materials and Construction
DuraFlex Pro: Single-wall .005″ 316 stainless steel.
DuraFlex SW: Single-wall .005″ overlapped 316 stainless steel (totalling .010″). Overlapped to create smooth inner wall.
DuraFlex 316 & 304: Single-wall .005” 316 or 304 stainless steel.
Clearances
DuraFlex Pro: 0″ clearance for gas, oil, and pellet applications. 1″ clearance to masonry for wood-burning applications. Insulation is required for 0″ clearance to masonry for wood-burning.
DuraFlex SW: Clearances 0″ clearance for gas, oil, and pellet applications. ” clearance to masonry for wood-burning applications. Insulation is required for 0” clearance to masonry for wood-burning.
DuraFlex 316 & 304: 0″ clearance for gas, oil, and pellet applications. 1″ clearance to masonry for wood-burning applications. Insulation is required for 0″ clearance to masonry for wood-burning.
Diameters
DuraFlex Pro & SW: 3″ – 12″.
DuraFlex 316 & 304: 3″ – 8″.
Listings
DuraFlex Pro: Listed to UL 1777 and ULC S635 (MH45609).
DuraFlex SW: Listed to UL 1777 (MH45609).
DuraFlex 316 & 304: Listed to UL 1777 and ULC S635 (MH45609).
Instructions
- DuraFlex® Stainless Steel: Factory Built Chimney Relining Installation Instructions
- DuraFlex® Stainless Steel: Flexible Chimney Liners Installation Instructions
Typical Installation
Refer to our Typical Venting Installation drawings to select the appropriate component parts for your installation.
More Typical Installations:
- The inner pipe diameter should match the outlet size of the appliance.
- Check the appliance manufacturer’s installation instructions to confirm which types of vent configurations are permitted (i.e. horizontal, vertical, chimney reline, etc.). Also, check for any venting restrictions such as maximum horizontal run, minimum and maximum vertical rise, maximum offset, etc.
- Be fire safe! Use proper support and bracing. Follow local building codes and have your venting system inspected.
Installation Key
| 1 | DuraFlex SS Cap |
| 2 | DuraFlex AL Cap |
| 3 | DuraFlex Top Plate |
| 4 | DuraFlex (SW, Pro, 304, 316) Length |
| 5 | DuraFlex AL Length |
| 6 | DuraFlex SS Tee |
| 7 | DuraFlex AL Tee |
| 8 | DuraFlex Mortar Sleeve |
| 9 | DuraFlex AL Coupling |
| 10 | DuraFlex SS Connector |
| 11 | PelletVent Pro Appliance Adapter |
| 12 | DuraBlack Trim Collar |
| 13 | Rigid Type B Gas Vent |
| 14 | Rigid PelletVent (L Vent) |
| 15 | ProFoil Insulation, AluFoil Tape & ProMesh |
| 16 | DVL or DuraBlack Pipe |
| 17 | Pipe Collar (B-Vent) |
Planning Your Installation:
- Verify the venting requirements of the appliance used. Choose the liner system appropriate for the appliance and installation.
- Refer to the Typical Installations for the type of liner installation similar to your situation. Identify the needed parts for installation.
- The size of the liner should match the outlet size on the appliance or the size of the vent/manifold that penetrates into the masonry chimney.
- Determined the length of the liner needed.
- Make sure of a proper fit for the Top Plate of the reliner to provide a secure, leak-proof installation.
- If a free-standing appliance is used, select the vent or stovepipe pieces to connect from the appliance to the liner (refer to the appropriate section of catalog).
- Important! Check to be sure the installation complies with all local and national code requirements, including clearance to combustibles. Contact the local building inspector for permit requirements.
Design Recommendations
- The following design recommendations are intended only as a general guideline to assist in the design and selection of liner components for your installation. Always read and follow Duravent Installation instructions (enclosed with the cap or support box) before installing DuraFlex. Installation instructions can be viewed online at www.duravent.com, under catalogs and instructions.
- Before relining a chimney, it should be cleaned and inspected to verify the integrity of the mortar and masonry. In addition, have a certified chimney professional determine if the masonry was constructed with 0” or 1” clearance to the surrounding combustibles. This is an important fire safety issue that may have an influence on how the liner is installed.
- Be sure to select the proper liner for the application. DuraFlex SS is used for appliances that use oil, wood, or wood-pellets for fuel; DuraFlex AL is for a non-condensing gas appliance. Refer to the appliance manufacturer for installation requirements affecting venting. Keep the vent path as straight as possible for best performance.
Relining Solutions
DuraVent is the first manufacturer to have a UL-listed relining system for factory-built chimneys to be used with solid-fuel appliances in the USA. When a homeowner installs a wood-burning insert into an existing UL127-listed fireplace, relining the existing chimney is critical for performance and safety. Check out the installation video on our youtube channel.
Product Bulletin:
- Relining Factory-Built Chimney Brochure 06-05-17
What does the UL listing cover?
All 127, 103, or 103HT chimneys
Insulated chimneys- all sizes with 2” clearance
Air cooled – clearance based on diameter
All Duravent UL1777 systems up to 8”
Flex does not need insulation.
Air Cooled Chimney Coverage:
Up to 8” I.D. chimneys with at least 1 ¼” wall (ex. 8×10½)
6×8½ is OK, 8×11 is OK
Up to 8” I.D. chimneys require at least 1 ½” clearance
Larger chimneys with at least 1 ½” wall (ex. 10×13)
9×12 is OK, 10×14 is OK, 16×19 is OK
Chimneys larger than 8” require at least 2” clearance
Factory-Built Reline Kit includes:
Cap
Storm Collar
Support Bracket
Ventilation Disk
Centering Bracket
DuraLiner 12” Length
Flex Connector
Flex Length (25’ or 35’)
Adjustable Band
Flex Adapter
Product Resources
Catalogs
Bulletins
- 2011 DuraFlex® Pro Most Flexible Chimney Liner On The Market Bulletin
- 2011 TherMix Chimney Liner Insulation Bulletin
- 2013 DuraFlex® – Relining a Factory-Built Chimney Can Now Be Done Safely With a Listed System Bulletin
- 2013 DuraFlex® Insert Adapter Bulletin
- 2017 Oil Sizing Chart Bulletin
- 2022 DuraFlex® 3″ – 8″ Removable Vertical Cap and Top Plate Bulletin
- 2022 DuraFlex® Custom Length Flex Liner Component Discontinuation Bulletin
Brochures
Sales Sheets
FAQ
What is in the ProMesh Insulation Kit?
A 22-inch by 25-foot roll of ProFoil insulation blanket, a 12-inch by 25-foot roll of ProMesh protective wire mesh and a 2-inch by 150-foot roll of aluminum tape, enough to insulate 25 feet of DuraFlex liner in 3 to 6 inch diameters. It is the insulation DuraVent specifies for a wood-burning reline.
When is liner insulation required?
For wood-burning appliances whenever you want the liner listed at zero clearance to the masonry; without insulation a DuraFlex liner venting wood needs 1 inch of clearance to the masonry. The requirement is a minimum of 1/2 inch of ProFoil (or Flexwrap) around the liner. For gas, oil and pellet appliances insulation is optional but improves draft and cuts condensation, especially on exterior chimneys.
How is it installed?
Roll the ProFoil out, trim it so the flex end rings stay exposed, wrap it lengthwise around the liner and seal the seam with the aluminum tape, keeping at least 1/2 inch all round. Slip the ProMesh over the wrapped liner and secure the ends so it tightens snugly; the mesh protects the blanket while the liner is lowered. DuraVent’s instructions call for stainless band clamps at the ends.
Will an insulated liner still fit my flue?
Allow for the added thickness: the liner plus 1/2 inch of blanket and mesh must slide down the flue without forcing, so measure the smallest inside dimension of the tiles first. Where it is tight, DuraVent’s alternative is a poured TherMix insulation, 1 inch minimum, which is a separate product. Have the chimney cleaned and inspected before relining.
Does rigid DuraLiner need this kit?
No. Rigid DuraLiner is factory insulated and listed at zero clearance as supplied; this kit is for flexible DuraFlex Pro, SW, 316 and 304 liners. The 8-inch DuraLiner Insulation Kit covers DuraLiner flex. Liners, tees and top plates are in the DuraFlex Stainless category.
Shipping / Freight / Return Info
Same-Day / 24 hour shipping
Same-Day/24 hour shipping - If we have the product in stock, we can ship same day if ordered before 12pm Monday - Friday (CST).Freight Claims Policy
- Open and inspect the order while the delivery driver is present. If delivery driver does not provide sufficient time to do so, please notate the delivery receipt.
- By signing the delivery receipt without noting any damage or missing items, you confirm that your order arrived complete and in excellent condition.
- Record any damage or missing pieces directly on the delivery receipt.
- Do not discard damaged item(s) or any original packaging. For severe damage, write “Refused due to damage” on the delivery receipt and contact us immediately.
- Report any damage within two business days, including delivery details and photos showing the issue
- Damaged item(s) must be returned within 30 days. Failure to return them will result in a charge to the original payment method.
Return Merchandise Authorization Policy
- Submit your return request within 30 days of delivery.
- You will receive an email within 1-2 business days confirming whether your return request has been approved or denied.
- Please also note that a 20% restocking fee may apply to approved returns
- If approved, you will receive an itemized Return Authorization, return shipping labels (if requested), and detailed instructions within 1–2 business days
- From the date this email is received, you will have 14 days to return the product.
- Once our distributor receives and inspects the returned item(s), your refund will be issued within 1–2 weeks
- Items returned outside of this process or time frame are not eligible for a refund.
Customer Reviews
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What Our Customers Say
D
A sauna turns your garden into a spa oasis. We debated it for a while, but after renovating our house, we pulled the trigger and bought a sauna from Norse Steam and Maya. She was always super responsive and helpful throughout the process. Don't kid yourself, getting a really nice sauna is not that easy. Sizing and heating need to be figured out, as does the building, but we have always had a helpful partner on our side. She never upsold us on anything we didn't need, and we got some nice freebies when the sauna was delivered. And now we can really enjoy every moment in our garden.
KF
I'm really happy with my sauna purchase. Maya gave above and beyond excellent customer service. She wasn't pushy and gave impressive followup after the delivery to make sure everything was just right.
DE
I enjoy my FD2 Sauna with Red Light, Infrared and radiant heat. Use it 5x a week and my post workout soreness is minimal and sleep great. Maya at Norse Steam was excellent to work with.
B
We purchased the 3-person sauna for our outdoor garden. We chose the cube sauna for the aesthetic and could not be happier.
I assembled by myself except for the 2 large panels (requires a few people). Instructions were good - took me two partial Saturdays to complete and a few hours to unpack and organize in advance of assembly. Had my elec. add a NEMA enclosure on the back for the controller and power for lights and a 2nd panel for the wireless control.
Customer service was excellent
MP
Awesome Sauna and Awesome Company and Experience purchasing it from Maya!
After much research I chose the Finnmark FD-2 and it has met and exceeded all my expectations! Easy to assemble and it functions great - just as advertised. I highly recommend it for home use!
EA
Recently purchased the Finnmark one person after much research. Extremely happy with it and the ordering process. Maya was very responsive and helpful during the process and keeping us updated while we waited for shipment. There were several places I could have ordered this, but i chose Norse Steam based on the communication and customer service which was fantastic. The shipment was also excellent. The setup was pretty seamless for two people - but the best part is the sauna experience 10/10
G
Maya is amazing - super helpful and responsive. Looked at many stores, these guys have the best prices and service. Highly recommend
GR
Norse Steam, and specifically Maya, were extremely helpful as I was making the decision for our Sauna. I was able to get all of the necessary details to make a decision as construction was happening in my backyard to make space for it.
We absolutely love the CL7G. It is extremely comfortable for 6 people (can fit more less comfortably). The Thermory Spruce and Aspen in the interior smells great. The lighting is lovely. We paired the CL7G with the Harvia Spirit 10.5kw.
RS
Had great experience shopping at Norse Steam for the new heater. They had very good deal, with rocks. Customer service was good, and responded very fast with my questions. Received the heater, and it looks good, and the quality seem to be great. Will install soon, and am very excited to start experiencing sauna the way it ment to be
O
positive purchase experience - Harvia Legend 150 SL woodstove
thanks Norse Steam for flawless transaction - I got instant replies on my questions, received competitive price on the wood stove and got it delivered within two weeks!
Can highly recommend Norse Steam for others.
JR
Smoking Hot Tub!
I got the Norse Steam SaunaLife wood-fired hot tub, the S4N model, and its been seriously great. It heats up quicker than I expected, usually around an hour and a half, and once its hot, it stays that way for a good long while. The wood-fired system is simple to use, and honestly kind of fun.
The tub itself feels solid and well put together. The thermo-spruce exterior looks beautiful in person, and the fiberglass interior is smooth, deep, and easy to clean. Its the kind of setup that just works without a bunch of fuss, which I really appreciate.
Also, the team at Norse Steam was genuinely great to work with. Super helpful, quick to respond, and made the process really easy from start to finish. It felt like they actually cared that I was happy with it. The tub has totally become a go-to way to unwind, and I wouldnt change a thing.
S
Maya was so knowledgeable and responsive
Maya was so knowledgeable and responsive. She helped me understand the product options and found a fantastic solution that fit our needs. Her follow through was very helpful and made us comfortable with our decision. We are extremely happy with the end result!
W
Great service
I recently purchased the Harvia Club sauna equipment, and I am thoroughly impressed with both the product and the customer service experience. The heaters robust performance and durable stainless steel construction make it ideal for larger sauna spaces, providing consistent heat and a relaxing environment. Its compatibility with advanced controls ensures a personalized sauna experience every time.
The customer service team was exceptional, prompt, knowledgeable, and helpful throughout the purchase process. They ensured smooth delivery and provided clear guidance on installation and operation. Overall, I highly recommend Harvia Club for anyone seeking premium-quality sauna equipment backed by excellent support!
BT
Great Sauna & Purchase Experience
Great experience purchasing Finnmark FD-2 from Norse Steam. Good communication and easy to assemble. Temperature increases quickly (30 minutes or less to 140) and maintains well. So far this has been a great purchase.
M
Great sauna and great customer service
We purchased the Finnmark SD-1 sauna. Maya was extremely helpful with the purchase. We had an issue with the sauna not reaching the maximum temperature, and Maya connected us with the appropriate technician that explained how to correct the issue. The sauna now heats to the maximum temperature (170 degrees) in less than an hour, and it is a great unit. We are very happy with it, and we would definitely purchase from NorseSteam if we needed any other items.
JK
Sauna Review
I recently purchased a sauna from Norse Steam, and I couldn't be more impressed with the entire experience. From start to finish, their customer service was exceptional, and Maya deserves special recognition for her outstanding support!
Maya was incredibly knowledgeable and patient, answering all my questions about the sauna features, installation process, and maintenance. She went above and beyond to ensure I selected the perfect model for my home. Even after the purchase, Maya followed up to make sure everything was running smoothly and that I was satisfied with my sauna.
The sauna itself is top-notch beautifully designed, durable, and easy to use. It's clear that Norse Steam takes pride in the quality of their products and their commitment to customer satisfaction.
If you're considering a sauna, I wholeheartedly recommend Norse Steam. With their excellent customer service and high-quality products, you're in great hands. Thank you, Maya, and the entire Norse Steam team for a fantastic experience!
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