DuraVent | DuraFlex 316 Stainless Steel 100' Flex Pipe Length

Save $212.47
DuraVentSKU: 3DF316-100

Regular price$1,912.18 Sale price$2,124.65
Flash Sale is ON! Free Shipping & Returns on All Orders. Get 15% off with the Code: FLASH15 for purchase over $199 and 19% off with the Code: FLASH19 for purchase over $8999. Best Deal Ever! Need Help? Call 800-466-4712 or mail us at sales@belleflame.com
Size: 3"
⛟ Estimated Delivery Date: Between and to all states excl. Alaska & Hawaii.


When it comes to venting solutions, DuraVent stands as the premier name in the industry. Offering a wide range of engineered venting products, DuraVent has solidified its reputation as the go-to choice for innovative, safe, and professional solutions in the HVAC and Hearth markets.

Introducing the DuraVent 100' Flex Pipe, constructed from robust DuraFlex 316 Stainless Steel. This product is a game-changer, providing lighter and more economical liners ideal for situations with minimal offsets in the chimney. Whether you have a wood-burning stove, a non-condensing gas appliance, or an oil-fired heater, DuraFlex 316SS has you covered. It's designed for durability and corrosion resistance, making it perfect for challenging conditions, such as those found with coal-fired appliances.


  1. Durability & Corrosion Resistance: DuraFlex 316 Stainless Steel ensures your venting system remains robust and resistant to corrosion, even in harsh conditions.
  2. Versatile Applications: This flexible pipe is suitable for a wide range of applications, including fireplace inserts, furnaces, boilers, and water heaters.
  3. Cost-Efficient: DuraFlex 316SS provides an economical solution without compromising on quality.
  4. Customizable Lengths: Tailor your venting system to your specific needs with custom lengths starting at 10 feet.
  5. Ease of Installation: DuraFlex 316SS is compatible with wood-pellet, non-condensing gas, wood-burning, and oil appliances, making it a versatile choice for your projects.


The DuraFlex 316 Stainless Steel flexible chimney relining is designed to excel in various applications. Use it confidently with gas, wood pellet, oil, or wood appliances, knowing it will perform flawlessly. Common applications include fireplace inserts, furnaces, boilers, and water heaters. DuraFlex 316 is the solution you need for harsher conditions that demand enhanced corrosion resistance, such as coal-fired setups.

Ideal Applications

  • Fireplace Inserts: Upgrade your fireplace with a reliable and durable venting solution.
  • Furnaces: Enhance furnace efficiency and performance with DuraFlex 316SS.
  • Boilers: Ensure your boiler operates optimally, even in challenging environments.
  • Water Heaters: Enjoy hot water consistently and reliably with this high-quality chimney liner.


Model Size Flex Length
3DF316-100 3" I.D 100 ft.
4DF316-100 4" I.D 100 ft.
5DF316-100 5" I.D 100 ft.
55DF316-100 5.5" I.D 100 ft.
6DF316-100 6" I.D 100 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.

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.

Here's how it works:

  • Find a lower price on the same product from another retailer.
  • Contact us with the details of the offer, including the website or store name, product name, and price.
  • We'll verify the price and beat it by an additional 10%.

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.
  • No Sales Tax, no Hidden Fees: just the lowest prices on the market. When you shop with us, you can rest assured that the price you see is the price you'll pay. No matter where you live, you can enjoy tax-free shopping with us.
  • Fast and Free Shipping: We understand that you want your products as soon as possible. That's why we offer fast and free shipping on all orders.
  • Easy Returns: We want you to be completely satisfied with your purchase. If for any reason you're not happy, just let us know and we'll make it right.

Customer Reviews

Be the first to write a review

Guaranteed Secure Checkout

American Express Apple Pay Diners Club Discover JCB Mastercard Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

You may also like

Recently viewed