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DuraVent DuraPlus Square Ceiling Support Box: three heights to suit your ceiling slope
The DuraVent DuraPlus Square Ceiling Support Box is a metal box that holds the chimney at the ceiling. It works with flat, vaulted, or cathedral ceilings. A steeper slope needs a taller box to keep the chimney clear of the ceiling. Choose a 6 or 8 inch diameter, then the box height. The 11 inch box suits flat or gentle slopes, 24 inch suits medium slopes, and 36 inch suits steep slopes. The exact slope limits depend on the stovepipe used below. DuraPlus is DuraVent’s triple wall chimney, the insulated pipe that takes over from the stovepipe at the ceiling or wall and runs up past the roof.
The box carries up to 35 feet of chimney, and its built in starter lets the first chimney length lock directly into it. Below it, double wall DVL or single wall DuraBlack stovepipe connects using a separately sold chimney adapter. Leave 2 inches of air between the chimney and anything that can burn, including framing and insulation. Prefer a round collar for a flat ceiling? See the DuraVent DuraPlus Round Ceiling Support collar. The DuraVent DuraPlus Square Ceiling Support Box ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
Details
SKU: 6DP-CS11 | 6DP-CS24 | 6DP-CS36
SKU: 8DP-CS11 | 8DP-CS24 | 8DP-CS36
Applications
DuraPlus Chimney is a triple-wall, all-fuel chimney for use with wood stoves, fireplaces, furnaces, boilers, stoves, ranges, water heaters, or other appliances fueled by wood, oil, coal, or gas.
Materials and Construction
.016″ 430 stainless steel outer wall or .018″ galvanized steel outer wall.
.018″ aluminized steel intermediate liner.
.016″ 430 stainless steel inner liner.
Insulated layers of ceramic blanket plus ventilated air space. Locks tightly with a precision twist-lock connection.
Clearances
2″ clearance to combustibles.
Diameters
6″ and 8”
Listings
UL Listed to UL 103HT (MH7399).
Instructions
Typical Installation
Refer to our Typical Venting Installation drawings to select the appropriate component parts for your installation
Refer to our Typical Venting Installation drawings to select the appropriate component parts for your installation.
- A DVL/DuraBlack Chimney Adapter or DuraBlack Slip Connector must be used when connecting DVL or DuraBlack stovepipe to a Ceiling Support, Wall Thimble, or Finishing Collar. A Snap-Lock Adapter must be used when attaching snap-lock stovepipe to DuraPlus.
- A Wall Thimble must be installed with an appropriate section of chimney pipe for all horizontal through-the-wall installations. To accommodate thicker walls a wall thimble extension can be field fabricated.
- An Attic Insulation Shield must be used in all installations that pass through an attic, regardless of whether the attic is insulated or not. If chimney is enclosed in a chase in the attic space, an Attic Insulation Shield is not required.
- A Firestop Radiation Shield must be used when a chimney passes through a floor or ceiling without a Ceiling Support Box.
More Typical Installations:
Installation Key
| 1 | DVL or DuraBlack Stovepipe |
| 2 | Celling Support Box |
| 3 | Wall Thimble |
| 4 | DuraPlus Chimney |
| 5 | Attic Insulation Shield |
| 6 | Roof Flashing |
| 7 | Storm Collar |
| 8 | Chimney Cap |
| 9 | Elbow |
| 10 | Elbow Strap |
| 11 | Tee with Cap |
| 12 | Tee Support Bracket |
| 13 | Wall Strap |
| 14 | Firestop Radiation Shield |
| 15 | Snap-Lock Adapter, DVL/DuraBlack Chimney Adapter, DuraBlack Slip Connector |
| 16 | Extended Roof Bracket |
| 17 | DVL or DuraBlack Chimney Adapter |
| 18 | DVL or DuraBlack Tee |
| 19 | DVL or DuraBlack Elbow |
| 20 | Chase Top Flashing |
| 21 | Anchor Plate |
Planning Your Installation
The following recommendations are a general guideline to assist in the layout and selection of the chimney components needed for your installation. Always follow Duravent Installation instructions before installing your chimney system (enclosed with the cap or support box). Installation instructions can be viewed online at www.duravent.com, under catalogs and instructions.
- The diameter of the chimney should match the outlet size of the appliance. An improperly sized chimney results in poor draft and excessive creosote formation.
- Measure the diameter of the appliance flue outlet. Select the chimney and either DVL or DuraBlack connector stovepipe with the same size diameter as the appliance flue outlet. For fireplace installations, refer to the sizing chart in the back of the DuraTech section of this catalog.
- Determine if the installation is a through-the-roof installation or a through-the-wall installation. A through-the-wall installation will require additional components (Wall Thimble, Tee w/ Cap, Tee Support, and Wall Straps).
- Install the chimney in the interior of the structure whenever possible. A cold exterior chimney will produce less draft and will generate more creosote.
- If possible, avoid offsets that serve to restrict the natural draft. A straight vertical installation is more efficient and less likely to develop creosote. If an offset is required to avoid rafters or other obstructions, measure the horizontal distance required and the vertical height available. Both 15° and 30° elbows are available. Elbows greater than 30° are not allowed in the United States. A maximum of two offsets in a single installation are permitted. Refer to the offset table in the back of this catalog. At least one Elbow Strap is required for each offset. Elbow Straps ensure adequate support.
- Determine the minimum chimney height above the roof line. Building codes require a minimum of 3′ above the roof penetration and at least 2′ higher than any portion of a building within 10′. The termination cap is installed above that point. If chimney is more than 4′ above the roof penetration an Extended Roof Bracket is required.
- Measure the roof pitch. For example, a 6/12 pitch has a vertical rise of 6″ over a horizontal distance of 12″. Select the appropriate flashing.
- Determine the total length of chimney and stovepipe required for the installation. To calculate the installed per length of 6″-8″ DuraPlus chimney pipe, subtract 1 1/2″ per joint. Subtract 1 1/4″ per joint of DuraBlack stovepipe. Subtract 1 1/2″ per joint of DVL stovepipe. Minimum chimney height, at sea level of straight vertical chimney is 10′ to 15′ above the appliance outlet. Higher elevations, or the use of elbows or a tee, will require approximately 30% to 60% more height to provide for an adequate draft.
- Be fire safe. Maintain at least 2″ clearance to combustibles. Follow local building codes and have your chimney inspected by a certified professional.
Product Resources
Catalogs
Bulletins
Brochures
Sales Sheets
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.
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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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