DuraVent - DuraTech Round Ceiling Support Box

Save $152.48
DuraVentSKU: 12DT-RCS

Regular price$1,372.32 Sale price$1,524.80
Black Friday Sale is ON! Free Shipping & Returns on All Orders. Get 15% off with the Code: FRIDAY15 for purchase over $99 and 18% off with the Code: FRIDAY18 for purchase over $8000. Best Deal Ever! Need Help? Call 800-466-4712 or mail us at sales@belleflame.com
Size: 12"
⛟ Estimated Delivery Date: Between and to all states excl. Alaska & Hawaii.


When it comes to your home's safety and comfort, you deserve the best. That's why we introduce the DuraVent DuraTech Round Ceiling Support Box, the cornerstone of a safer, more efficient chimney system. As the premier company in the venting industry, DuraVent has a reputation built on innovation, quality, and professionalism, providing peace of mind for homeowners and professionals alike.

Our DuraTech Round Ceiling Support Box is engineered to perfection, offering optimal safety and performance. Crafted with refractory insulation encased between dual walls, it excels at keeping the outer chimney wall cool while ensuring high flue gas temperatures for unparalleled draft performance. What sets us apart is our commitment to safety; our inner wall is 25% thicker than competing chimneys, offering an extra margin of security. Say goodbye to the hassle of locking bands and mechanical fasteners, as none are required for our dependable support system.

With DuraTech, you can be confident that your chimney is built to withstand the harshest conditions. Our support box is tested and listed for continuous operation at 1000°F flue gas temperatures, enduring one hour at 1400°F and ten minutes at 1700°F, all in accordance with the rigorous UL 103 test standard. Your safety is our top priority.


  • Enhanced Safety: The DuraTech Round Ceiling Support Box features a 25% thicker inner wall than its competitors, providing an additional layer of security for your home.
  • Efficient Draft Performance: Crafted with refractory insulation and dual walls, this support box keeps the outer chimney wall cool while maintaining high flue gas temperatures for optimal draft performance.
  • Hassle-Free Installation: No need for locking bands or mechanical fasteners, making installation a breeze.
  • Wide Temperature Range: Tested and listed for continuous operation at 1000°F flue gas temperatures, ensuring durability even in extreme conditions.
  • Supports up to 40' of DuraTech Chimney: Our support box offers unmatched versatility for your chimney system.
  • Precise Fit: Available in multiple sizes to accommodate your specific needs.
  • Peace of Mind: Backed by a limited-lifetime warranty, you can trust DuraVent for the long-term safety of your home.


  • Supports chimney pipe and provides a positive connection between support box and chimney.
  • Supports up to 40' of DuraTech Chimney.
  • Trim collars are sold separately.
  • (For 10” use DuraBlack Slip Connector to attach DuraBlack to the support box. See DuraBlack section).


Model Dimensions
12DT-RCS 12-5/16" (A) x 16" (B) x 18" (C)
14DT-RCS 14-5/16" (A) x 18" (B) x 20" (C)
16DT-RCS 16-5/16" (A) x 20" (B) x 22" (C)
Clearances 2" clearance to combustible.
Listings c-UL-us listed to UL 103 and ULC S604 (MH7399)
Warranty Limited-lifetime warranty


About the Manufacturer:

Consistently the first to market with new innovations in venting systems, DuraVent has captured a leadership position in emerging markets. DuraVent has patents for several products and continues to design safe and technologically advanced venting.The company’s research into solving problems with corrosion, when biofuels such as corn are used, led to the break-through patent for PelletVent Pro.

Order Confirmation:

Upon placing your order, you will promptly receive an email confirmation. Subsequently, we will conduct a thorough inventory check to ensure all items are in stock and available for immediate shipment. If your order aligns with the advertised delivery timeframe, we will promptly process it for shipment to our warehouse. In cases where the expected delivery time extends beyond the advertised timeframe, we will reach out to you via email and/or phone for confirmation.

Order Shipment:

Within one business day of your item being shipped, you will receive an email confirmation containing a tracking number. If you do not receive tracking information within six business days of placing your order, please don't hesitate to get in touch with us for assistance.

Estimated Time of Arrival:

Our typical delivery timeframe ranges from 2 to 10 business days. Custom-made products generally require 3 to 5 weeks for delivery. If the expected delivery date for your order would fall outside of the advertised 2-10 business day time frame, our customer service team will contact you to ensure your agreement with the revised timeline.

Covered Areas:

Please note that all estimated delivery dates and shipping costs advertised on our website apply exclusively to the Contiguous United States. For inquiries regarding shipping to Hawaii or Alaska, kindly reach out to our customer service team. While we do not offer direct shipping to Canada, we are more than willing to ship your order to the freight carrier of your choice.


It is very important that you inspect the packaging of your items when they arrive and check if you received all boxes listed on the delivery receipt. If you notice any damage or shortage of packages, you must make note of it on the bill of lading, take pictures, and refuse delivery. Your note should say "refused due to damage". You must also take photos of all sides of the box and send them to us within 2 days. If there are no damages visible before opening the box, you must note "subject to further inspection may contain concealed damage". If you notice any damage after receiving the delivery, do not throw the box away, and contact us with the photos. After we receive information from you about the refused delivery or concealed damage, we immediately initiate a claim with the shipping company or with the manufacturer. After the claim is fully processed, we ship all replacements at absolutely no cost to you.

Cancellations & Refunds:

We offer free order cancellations before the shipping label or Bill of Lading is generated, or prior to the commencement of production for custom orders. Please note that custom-made items are not eligible for refunds once production has begun. To be eligible for a return, the item must be unused and in its original condition, with all packaging intact and in perfect condition. Orders delivered outside of the United States are not eligible for refunds. If your order arrives damaged, please refer to the "Damages" section. Our refund policy extends for 30 days. If 30 days have elapsed since your purchase, regrettably, we cannot process a refund. Prior to returning an item, please contact us to discuss shipping details. All refunds will be credited to the original credit card or PayPal account used for the purchase, within two days of receiving the returned items at our warehouse.

Please contact sales@belleflame.com for any questions regarding shipping time.

At Belleflame, we're committed to providing our customers with the best prices on the market. That's why we offer a 110% best price guarantee. If you find a better deal on the same product somewhere else, just let us know and we'll beat it by an additional 10%.

We believe that shopping should be easy, convenient, and most importantly, affordable. That's why we work hard to bring you the lowest prices on the products you love. But if you do happen to find a better deal elsewhere, we'll go the extra mile to make sure you get the best deal possible.

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It's that simple! Our 110% best price guarantee ensures that you'll always get the best deal possible when you shop with us. So, why wait? Start shopping now and experience the difference of shopping with Belleflame.

At Belleflame, we believe that shopping should be simple, stress-free, and most importantly, enjoyable. That's why we work hard to bring you the best products, prices, and customer service in the industry.

Here are just a few reasons why you should choose us:

  • Wide Selection of Products: We offer a vast selection of top-quality products from the leading brands in the industry. No matter what you're looking for, we have something for everyone.
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