DuraVent | DuraFlex 316 Stainless Steel Basic 35' Flex Pipe Length Kit

Save $92.95
DuraVentSKU: 3DF316-35K

Regular price$836.59 Sale price$929.54

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Size: 3"
⛟ Estimated Delivery Date: Between and to all states excl. Alaska & Hawaii.

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When it comes to reliable and efficient venting solutions, DuraVent stands as the unrivaled industry leader. Our commitment to excellence is showcased in the DuraVent 35' Flex Pipe Kit, a pinnacle of engineering designed to cater to your HVAC and Hearth needs.

Crafted from high-grade DuraFlex 316 Stainless Steel, this kit offers you more than just venting; it offers peace of mind. With DuraFlex 316, you're investing in a product that not only excels in performance but also stands up to the harshest of conditions, making it the perfect choice for coal-fired appliances and more.

Upgrade your venting system and experience the DuraVent advantage. Our kit includes a range of essential components: the DuraFlex SS Top Plate with Welded Storm Collar, the DuraFlex SS Removable Vertical Cap, the DuraFlex SS Connector, and the DuraFlex 316 Length. Each piece is meticulously crafted to ensure a seamless and safe installation process.


  1. Exceptional Durability: Crafted from top-tier DuraFlex 316 Stainless Steel, this kit guarantees long-lasting, corrosion-resistant performance.

  2. Versatile Applications: Suitable for a wide range of applications, from fireplace inserts to boilers, ensuring your venting needs are met efficiently.

  3. Customization: Tailor the kit to your specific requirements with available custom lengths, providing flexibility for your project.

  4. Safety First: DuraVent components are listed as UL 1777 and ULC S635, ensuring the utmost safety and compliance.

  5. Easy Installation: Designed for a hassle-free setup, this kit includes all the essential components you need for a successful installation.

Key Features

  1. Multiple Length Options: Choose from 15’, 20’, 25’, 30’, and 35’ lengths to suit your unique project needs.

  2. Comprehensive Kit: This kit includes all necessary components, from the top plate to connectors, ensuring a complete and hassle-free installation process.

  3. High-Quality Materials: Crafted from DuraFlex 316 Stainless Steel, renowned for its strength and corrosion resistance.

  4. Versatile Applications: Suitable for wood-pellet, non-condensing gas, wood-burning, and oil appliances, making it a versatile solution for various heating systems.

  5. Proven Safety: DuraFlex components are rigorously tested and listed for compliance, providing peace of mind for you and your family.


The DuraVent 35' Flex Pipe Kit is your go-to solution for a variety of applications, including:

  • Fireplace Inserts: Enhance the efficiency of your fireplace with reliable venting.
  • Furnaces: Ensure your furnace operates at peak performance with DuraVent.
  • Boilers: Experience optimal venting for your boiler system.
  • Water Heaters: Maintain safety and efficiency in your water heating setup.
  • Wood, Gas, and Oil Appliances: Versatile enough to accommodate a range of heating sources.


Model Size Flex Length
3DF316-35K 3" I.D 35 ft.
4DF316-35K 4" I.D 35 ft.
5DF316-35K 5" I.D 35 ft.
55DF316-35K 5.5" I.D 35 ft.
6DF316-35K 6" I.D 35 ft.
7DF316-35K 7" I.D 35 ft.
8DF316-35K 8" I.D 35 ft.
Materials 316 Stainless Steel
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


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.

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