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DuraVent 4"-12" Inner Diameter DuraFlex Sleeve

DuraVent 4"-12" Inner Diameter DuraFlex Sleeve

Regular price $75.06
Regular price $83.40 Sale price $75.06
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DuraVent is the premier company in the venting industry. With a broad range of engineered venting products, DuraVent has earned its reputation as the industry leader by offering innovative, safe, and professional products for the HVAC and Hearth markets.


A Flexible Solution For Any Installation

Having a choice when making a decision is essential. DuraVent offers the installer a range of products to make the right decision for the right situation. There are four DuraFlex liners and a complete selection of DuraFlex universal components. No matter which flexes is right for the situation, there's a DuraVent component to complete the venting system



  • Use to connect a liner into an appliance flue collar.


DuraFlex SW smooth wall flexible relining for a masonry chimney. Use with gas, wood pellet, oil, or wood appliances. Applications include fireplace inserts, furnaces, boilers, and water heaters.



    Model Size
    4DFS-SLV 4" (I.D) x 4.333" (O.D) x 4.5" (H)
    5DFS-SLV 5" (I.D) x 5.333" (O.D) x 4.5" (H)
    55DFS-SLV 5.5" (I.D) x 5.75" (O.D) x 4.5" (H)
    6DFS-SLV 6" (I.D) x 6.333" (O.D) x 4.5" (H)
    7DFS-SLV 7" (I.D) x 7.5" (O.D) x 4.5" (H)
    8DFS-SLV 8" (I.D) x 8.3" (O.D) x 4.5" (H)
    10DFS-SLV 10" (I.D) x 10.3" (O.D) x 4.5" (H)
    12DFS-SLV 12" (I.D) x 12.25" (O.D) x 4.5" (H)
    Construction Single-Wall
    Clearance 0” clearance for gas, oil, and pellet applications.
    Clearance 1” clearance to masonry for wood-burning
    Listings Listed to UL 1777 and ULC S635 (MH45609).
    Warranty Limited lifetime warranty



    Warning: This product can expose you to Chromium, which is known in the state of California to cause cancer, congenital disabilities, or other reproductive harm. For more information, see CA Prop 65 Warning

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    • Researched and ordered my fireplace from US FIreplace Store. Pricing was a fair value however, the customer service was EXCELLENT! I had an issue with the direct vent venting. I called US Fireplace and the correct items were sent out the next day AND Janessa stayed on top of my return authorization and sent me the permissions and documents I needed to return the incorrect item and no cost to me, including return shipping. Overall, I am a very satisfied customer and my fireplace looks and operates flawlessly. I am glad that I selected US FIreplace to source my direct vent fireplace. Thank you for the great service.


      Monteagle, TN

    • I had placed an order, through Lowe's Home Improvement, for an Electric Firebox: Revillusion RBF42. Ordered 1st part of January. Was told I would have it in 3 weeks. When checking to see is it came in, was told it was delayed to 3/15. Was then told is was delayed until 4/25. Waited until 4/27 to check on it. Was then told it was now delayed until August. This firebox was going in a new Sun Room addition. I could not get my final inspection until the Firebox was installed. I went on line and googled for this same product. US Fireplace Store web site was given to me. This was on a Saturday. I call and reached a very nice man. Explain what I was look for. He checked and told me they had 30 of them in stock. I almost fell out of my chair. I clarified with him the product I was wanting. I ask how soon could I get it. He told me it would ship today. Again, was amazed. It arrived on the following Monday. What a pleasure and a relief working with US Fireplace Store and their employees. Exceed my expectations.

      Thomas W.

      Fort Mill, SC

    • Great prices, quick delivery and fast hassle free services on the issue I encountered. I had purchased an electric fireplace unit that would not fit into the existing fireplace space. With one email I was able to get the wrong fireplace refunded and picked up at my home at no extra cost and the new one I purchased and delivered free of charge. Great company.

      John P.

      Denvers, MA

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