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

Save $96.28
DuraVentSKU: 3DFPRO-35K

Regular price$866.46 Sale price$962.74
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Size: 3"
⛟ Estimated Delivery Date: Between and to all states excl. Alaska & Hawaii.


Welcome to the world of premium venting solutions with the DuraVent 35' Flex Pipe Kit. As the leading authority in the venting industry, DuraVent consistently delivers top-notch products engineered to perfection. Our commitment to innovation, safety, and professionalism has made us the go-to choice for HVAC and Hearth markets.

The DuraFlex Pro Stainless Steel Basic Kit is the epitome of flexible steel liners. It boasts 20% more stainless steel per foot compared to competitors, ensuring superior strength and longevity. Whether you're faced with challenging installations or multiple offsets, DuraFlex Pro rises to the occasion, making venting easier than ever.

Key Features

  1. Premium Stainless Steel: Crafted from highly corrosion-resistant 316 Stainless Steel, this kit guarantees durability and reliability, ensuring it stands the test of time.

  2. Versatile Length Options: Our kit is available in 15', 20', 25', 30', and 35' lengths, catering to a wide range of installation needs.

  3. Complete Kit: This comprehensive kit includes essential components such as the DuraFlex SS Top Plate with a welded Storm Collar, DuraFlex SS Removable Vertical Cap, DuraFlex SS Connector, and a DuraFlex Pro Length.

  4. Easy Installation: The DuraFlex SS Top Plate with Welded Storm Collar ensures a secure seal at the top of the masonry chimney, simplifying installation with its fast connect band.

  5. Termination Convenience: The DuraFlex SS Removable Vertical Cap provides an efficient way to terminate your relining system, easily attaching to the storm collar with a fast connect band.


  1. Simplified Installation
  2. Enhanced Durability
  3. Premium Stainless Steel Construction
  4. Versatile Length Options
  5. Complete Kit for Comprehensive Venting Solutions


Model Size Flex Length
3DFPRO-35K 3" I.D 35 ft.
4DFPRO-35K 4" I.D 35 ft.
5DFPRO-35K 5" I.D 35 ft.
55DFPRO-35K 5.5" I.D 35 ft.
6DFPRO-35K 6" I.D 35 ft.
7DFPRO-35K 7" I.D 35 ft.
8DFPRO-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


DuraFlex Pro is the ultimate solution for relining masonry chimneys, compatible with gas, wood pellet, oil, or wood appliances. It finds its application in a wide range of heating systems, including fireplace inserts, furnaces, boilers, and water heaters.

Typical Installations

  1. Fireplace Inserts: Upgrade your fireplace insert with DuraFlex Pro for efficient and safe venting.

  2. Furnaces: Ensure your furnace operates at peak performance with our reliable venting solution.

  3. Boilers: Keep your boiler system running smoothly with the strength and flexibility of DuraFlex Pro.

  4. Water Heaters: Enhance the efficiency of your water heater system with DuraVent's premium venting kit.


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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