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DuraVent 8" DuraPlus Cathedral Ceiling Support Kit

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The DuraVent 8" DuraPlus Ceiling Support Box Kit is an innovative kit developed to install a durable, reliable chimney system in buildings boasting cathedral ceilings seamlessly and stylishly. Designed with care, this package contains all the necessary parts that ensure an adequate and appealing fit for your 8" DuraPlus chimney. The set includes:

1. 8" DuraPlus Storm Collar: Offering an additional layer of defense, the storm collar establishes a watertight seal around the chimney, reinforcing its resistance against adverse weather conditions.

2. 8" DuraPlus Chimney Cap: The chimney cap is a barrier that keeps outside garbage, raindrops, and other external elements while permitting sufficient air circulation.

3. 8" DuraPlus Ceiling Support Box: The ceiling support box is an essential element that lets the chimney go through the cathedral ceiling while keeping a solid and safe connection. It is constructed for both sturdy support and artistic integration.

4. 8" DuraPlus Flashing: By preventing water from penetrating the flashing and acting as a weatherproof barrier, it helps to keep the roof waterproof overall and maintains the structural integrity of the chimney system.

A whole and unique solution is the DuraVent 8" DuraPlus Cathedral Ceiling Support Box Kit. It discusses the pragmatic aspects of installing chimneys and emphasizes a sophisticated and cohesive style for cathedral ceiling arrangements. This kit demonstrates DuraVent's dedication to offering a dependable and comprehensive chimney system built specifically for installations in cathedral ceilings.


  • Triple-wall chimney
  • Clean, smooth exterior finish
  • 2" clearance to combustibles
  • For Interior or Exterior Installations
  • Adjusts 2”-6” from the wall
  • Use when air-cooled chimney is required
  • Outer diameter is 4" larger than inner diameter
  • Wall straps are required every 4' on the exterior of the building
  • Free-floating inner 430-alloy liner maintains structural integrity in chimney fires
  • Use in interior or exterior installations to support and stabilize the chimney while assuring a 2” clearance
  • For uses with wood stoves, fireplaces, furnaces, boilers, stoves, ranges, water heaters, or other appliances fueled by wood, oil, coal, or gas


 Size:  8" Inner Diameter
 Material:   Stainless Steel | Aluminum | Galvanized
 Fuel Type:   Coal, Oil, Wood, Gas
 UL Listed:   UL-103-HT
 Vent Construction:  Triple Wall
 Type:   Kit


DuraPlus All Fuel Triple Wall Chimney System - UL 103HT

The DuraPlus All Fuel Triple Wall Chimney System, UL 103HT, is a cutting-edge solution engineered to excel in both functionality and safety. It has been meticulously designed to offer exceptional performance, providing a hot draft on the inside, enhancing stove efficiency, and ensuring a fire-safe environment for your building. This triple-wall chimney boasts a unique construction with two insulating layers - a ceramic blanket and an insulating air space. Unlike traditional loose-fill insulation, the ceramic blanket remains securely in place, eliminating hot spots and potential hazards. Furthermore, in the unlikely event of a creosote fire, the chimney liner can expand outwardly in a radial direction, minimizing risks.


Temperature Resilience: Designed for normal, continuous operation at flue gas temperatures up to 1000°F, the DuraPlus Chimney exceeds rigorous UL standards. It has undergone stringent testing, including one hour at 1400°F and three ten-minute chimney fire tests at 2100°F, ensuring unmatched durability and fire safety.

Versatile Applications: The DuraPlus Chimney is a versatile, all-fuel solution suitable for various heating appliances. It can be used with wood stoves, fireplaces, furnaces, boilers, stoves, ranges, water heaters, or any other appliance powered by wood, oil, coal, or gas. This adaptability makes it an ideal choice for a wide range of heating systems.

Materials and Construction

Outer Wall: Choose between a sturdy .016″ 430 stainless steel outer wall or a robust .018″ galvanized steel outer wall, both of which offer exceptional corrosion resistance.

Intermediate Liner: The .018″ aluminized steel intermediate liner enhances the chimney's structural integrity and longevity.

Inner Liner: A reliable .016″ 430 stainless steel inner liner contributes to efficient venting and durability.

Insulation: The chimney features two layers of insulation, including a ceramic blanket, and a ventilated air space, enhancing thermal performance.

Precision Connection: The DuraPlus Chimney securely locks in place with a precision twist-lock connection, ensuring a snug fit and ease of installation.

Clearances: The DuraPlus Chimney maintains a safe distance from combustibles, requiring only a 2" clearance, providing peace of mind regarding fire safety in your building.

Diameters: Available in diameters ranging from 6" to 8", the DuraPlus Chimney accommodates various venting needs and system configurations.

Listings: The DuraPlus All Fuel Triple Wall Chimney System is UL Listed to UL 103HT (MH7399), guaranteeing compliance with the most stringent safety standards.

Frequently Asked Questions

Q: Is DuraPlus Chimney suitable for my heating appliance?
A: DuraPlus Chimney is compatible with a wide range of heating appliances, including wood stoves, fireplaces, furnaces, boilers, stoves, ranges, water heaters, and more, regardless of whether they use wood, oil, coal, or gas as fuel.

Q: What is the significance of the two insulation layers in DuraPlus Chimney?
A: The dual insulation layers, including a ceramic blanket and ventilated air space, ensure that the chimney stays cool on the outside and maintains high temperatures on the inside, improving overall stove efficiency and safety.

Q: Is DuraPlus Chimney easy to install?
A: Yes, DuraPlus Chimney features a precision twist-lock connection system, simplifying the installation process while ensuring a secure and reliable fit.

Q: How does DuraPlus Chimney ensure fire safety?
A: DuraPlus Chimney is designed to withstand high temperatures and has been tested extensively under extreme conditions, exceeding UL standards. In the event of a creosote fire, the chimney liner can expand outwardly to minimize risks.

Choose DuraPlus All Fuel Triple Wall Chimney System, UL 103HT, for a robust and reliable solution that enhances your heating system's efficiency while prioritizing safety and durability.

Manufacturer's Warranty

DuraVent, Inc. (“DuraVent”) provides this limited lifetime warranty for all of its products with the exception of Ventinox® (lifetime), and PolyPro® (ten years). Subject to the limitations set forth below, DuraVent warrants that its products will be free from defects in material or manufacturing, if properly installed, maintained and used. DuraVent products are fully warranted if installed only by a professional installer. This Warranty is transferable from the original homeowner to the buyer of the home. This warranty does not cover normal wear and tear, smoke damage or damage caused by chimney fires, acts of God, or any product that was: (1) purchased other than from an authorized DuraVent dealer, retailer or distributor; (2) modified or altered; (3) improperly serviced, inspected or cleaned; or (4) subject to negligence or any use not in accordance with the installation instructions included with the product as determined by DuraVent. Installation instructions are available online at under Support/Literature and through our Customer Service Department 800-835-4429 or [email protected]. This limited lifetime warranty applies only to parts manufactured by DuraVent.

DuraVent provides the following warranties for its products: One Hundred Percent (100%) MSRP 15 years from the date of purchase, and Fifty Percent (50%) thereafter, except for the following limitations on: all Termination Caps and DuraBlack® are warranted at One Hundred Percent (100%) for five years. All warranty obligations of DuraVent shall be limited to repair or replacement of the defective product pursuant to the terms and conditions applicable to each product line. These remedies shall constitute DuraVent’s sole obligation and sole remedy under this warranty. This warranty provides no cash surrender value. The terms and conditions of this warranty may not be modified, altered or waived by any action, inaction or representation, whether oral or in writing, except upon the express, written authority of an executive officer of DuraVent.

Corn, bio-fuels, driftwood or other wood containing salt, preservative-treated lumber, plastic and household trash or garbage, or wood pellets containing such materials must not be burned in the appliance or fireplace. In case of a chimney fire, the chimney must be inspected and approved by a certified Chimney Sweep before reuse. After each annual inspection, maintenance, and cleaning, the certified Chimney Sweep must fill out and date the appropriate section of the warranty card provided with the chimney liner.

Notwithstanding any other terms or conditions of this Limited Lifetime Warranty, DuraVent provides no warranty for the following specific products if such products are not installed by a qualified professional installer: DuraTech®, DuraPlus HTC®, DuraChimney® II, PelletVent Pro®, DirectVent Pro®, FasNSeal®, FasNSeal® W2, FasNSeal® Flex, and PolyPro®, and DuraVent’s relining products including DuraLiner®, DuraFlex® (SW, Pro, 316, 304), and Ventinox®. For purposes of this warranty, a trained professional installer is defined as one of the following: licensed contractors with prior chimney installation experience, CSIA Certified Chimney Sweeps, NFI Certified Specialists, or WETT Certified Professionals.

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Last updated on May 30th 2024.



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