DuraChimney II

DuraChimney II by Duravent: Elevate Your Fireplace Experience with Effortless Installation and Fire-Safe Design!

Product Description

Experience the next level in chimney innovation with DuraChimney II by Duravent. This exceptional factory-built alternative redefines fireplace installations, offering a unitized, lightweight design for faster setup. Designed to stay cool on the outside while providing a hot draft on the inside, DuraChimney II ensures a fire-safe solution for your chimney needs.

Product Features

Double-Wall, Air-Cooled Design: Allows for radial and lengthwise expansion under high temperatures.
Temperature Resilience: Tested for continuous operation at 1000°F flue gas temperatures, one hour at 1400°F, and ten minutes at 1700°F.
Versatile Applications: Ideal for masonry fireplaces burning wood, oil, coal, or gas.
Unitized Pipe Sections: No field assembly required, ensuring a hassle-free installation process.
Clearances: Maintains a 2″ clearance to combustibles for added safety.
Various Diameters: Available in 10″, 12″, 14″, and 16″ options to suit different fireplace needs.

DuraChimney II

Product Specifications

Materials and Construction:

Inner Wall Material: 0.016″ 430 stainless steel
Outer Wall Material: 0.021″ galvanized steel (For stainless steel outer wall, contact Customer Service)
Construction: Unitized pipe sections, no field assembly required

Type: Double-wall, air-cooled chimney system
Expansion Capability: Allows radial and lengthwise expansion under high temperatures
Temperature Ratings:

Continuous Operation: 1000°F flue gas temperatures
One Hour: 1400°F
Ten Minutes: 1700°F
Testing Standard: UL 103

Suitable for masonry fireplaces
Compatible Fuels: Wood, oil, coal, or gas

Clearance to Combustibles: 2 inches
Diameters Available:

10″, 12″, 14″, and 16″

UL Listed to UL 103 and ULC S604 standards (MH7399)
Typical Installation Components:

Chimney Cap
Storm Collar
Chase Top Flashing
Roof Radiation Shield
Chimney Section
Elbow Strap
Attic Insulation Shield
Anchor Plate
Anchor Plate with Damper
Supplementary Support
Wall Strap

Installation Options

Straight Vertical Installation:

Optimal for efficiency and reduced creosote formation.
Ideal when no offsets are necessary.
Provides a straightforward, sleek aesthetic.
Offset Installation:

Use when unavoidable obstacles, such as rafters, require horizontal displacement.
Choose between 15° and 30° elbows for flexibility.
Maximum of two offsets (four elbows) in a single installation.
Elbow Straps required for support.
Chase Installation:

Install the chimney in an enclosed chase.
Enhances safety and aesthetics by concealing the chimney.
Suitable for both straight and offset installations.
Minimum Chimney Height Considerations:

Calculate minimum chimney height above the roof line.
Follow building codes requiring a minimum of 3′ above the roof penetration.
Must be at least 2′ higher than any part of a building within 10′.
Chase Top Flashing and Storm Collar:

Utilize Chase Top Flashing for a secure and weatherproof chimney termination.
Storm Collar required for all installations using a flashing.
UL Approved Shroud:

Consider a UL approved shroud for added protection and aesthetics.
Follow DuraChimney II Shrouds Installation Instructions (L181) available online.
Clearance to Combustibles:

Maintain at least 2″ clearance to combustibles for fire safety.
Follow local building codes and regulations.
Professional Inspection:

Have your chimney inspected by a certified professional.
Ensure compliance with safety standards and regulations.

Fuel Types

Gas, Wood

Fuel Type Application

The DuraChimney II by Duravent Fireplaces is designed to be compatible with various fuel types commonly used in different heating systems.

Clearances and Cavity Measurements

Clearance to Combustibles:

Maintain a minimum of 2 inches of clearance to combustible materials. This ensures fire safety and prevents the risk of overheating nearby materials.
Chase Installation:

When installing the chimney in an enclosed chase, follow the recommended clearance guidelines to ensure proper ventilation and safety.
Minimum Chimney Height Above Roof Line:

Calculate the minimum chimney height above the roof line, following building codes and regulations.
The chimney must extend at least 3 feet above the roof penetration and be at least 2 feet higher than any part of a building within 10 feet.
Cavity Measurements and Planning:

Chimney Diameter:

Measure the diameter of the fireplace flue outlet to determine the appropriate size for the DuraChimney II.
Select a chimney with the same diameter as the fireplace flue outlet for optimal performance.
Straight Vertical Installation:

If possible, opt for a straight vertical installation for increased efficiency and reduced creosote formation.
Measure the total length of chimney required for a straight vertical installation.
Offset Installation:

If offsets are necessary, measure the horizontal distance required and the vertical height available.
Two types of elbows (15° and 30°) are available for offset installations, with a maximum of two offsets allowed in a single installation.
Use Elbow Straps for support in offset installations.
Custom Installations:

For unique or custom installations, take accurate measurements and consult with DuraVent’s Customer Service to ensure proper component selection and installation.


Limited warranty

Product Highlights

Elevate your fireplace experience with the DuraChimney II by Duravent, offering exceptional efficiency and safety. This factory-built alternative to pre-fabricated masonry chimneys is designed for effortless installation, thanks to its unitized, lightweight construction that eliminates the need for field assembly. The double-wall, air-cooled design not only ensures a hot draft on the inside but also maintains a cool exterior, providing a fire-safe solution that protects both the chimney and the building.

Engineered for durability, the DuraChimney II undergoes rigorous testing and is UL Listed to UL 103 and ULC S604 standards (MH7399). It can withstand continuous operation at 1000°F flue gas temperatures, endure one hour at 1400°F, and withstand ten minutes at 1700°F. This exceptional resilience makes it a reliable choice for a variety of heating applications, including wood, oil, coal, or gas-burning fireplaces.

Tailor your fireplace setup with versatility as DuraChimney II is available in diameters of 10″, 12″, 14″, and 16″. This wide range of sizing options ensures compatibility with various fireplace flue outlets, allowing you to choose the perfect fit for your heating needs.

Planning your installation has never been easier. The product provides a clear guide for selecting appropriate components, with detailed recommendations for chimney sizing based on the fireplace flue outlet diameter. Whether opting for a straight vertical installation or navigating offsets, DuraChimney II offers flexibility with elbow options and clear instructions for a seamless and efficient setup.

The option for an enclosed chase installation not only enhances safety but also contributes to the aesthetic appeal of your fireplace. Concealing the chimney within a chase provides a polished look, making it an attractive addition to any living space. Additionally, the availability of UL approved shrouds adds an extra layer of protection while enhancing the overall visual appeal of your fireplace system.

DuraChimney II ensures that you are well-supported throughout the installation process. The comprehensive support includes online resources such as installation instructions, sizing charts, and additional information available on the Duravent website. For any specific queries or unique installations, the Duravent Customer Service is ready to provide expert assistance, ensuring a smooth and satisfying experience with your DuraChimney II.

Company Overview for Manufacturer

Duravent Group is a leading manufacturer and innovator in the field of venting solutions for residential, commercial, and industrial heating systems. With a commitment to excellence and a focus on providing high-quality products, Duravent has established itself as a trusted name in the industry. The company’s diverse range of venting products addresses the needs of various heating applications, offering innovative solutions that prioritize safety, efficiency, and aesthetic appeal.

Founded on a dedication to quality craftsmanship and a passion for creating cutting-edge venting solutions, Duravent has been a pioneer in revolutionizing the way we approach fireplace installations. The company’s principles revolve around delivering products that not only meet but exceed industry standards, ensuring customers receive reliable and durable solutions for their heating systems.

Duravent’s product portfolio spans a wide range of venting solutions, including chimney systems, stovepipes, and specialized venting components. The DuraChimney II, one of the flagship products, showcases the company’s commitment to innovation and customer satisfaction. Duravent’s offerings cater to various fuel types, accommodating the diverse needs of homeowners, contractors, and builders alike.

Duravent takes pride in its adherence to rigorous safety standards and regulatory requirements. Products undergo extensive testing and are listed to industry standards such as UL 103 and ULC S604. This commitment ensures that Duravent’s venting solutions not only meet but exceed the safety expectations set by regulatory bodies, providing peace of mind to customers.

Duravent understands the importance of customer support in the successful implementation of its products. The company offers a wealth of resources, including online guides, installation instructions, and sizing charts, empowering customers with the knowledge needed for seamless installations. The Duravent Customer Service team stands ready to assist with any inquiries, ensuring a positive experience throughout the customer journey.

As an industry leader, Duravent prioritizes innovation in product design and manufacturing processes. The company continually seeks environmentally responsible practices, emphasizing sustainability in its operations. Duravent’s commitment to staying at the forefront of technological advancements reflects its dedication to providing state-of-the-art venting solutions.

Duravent Group’s legacy is built on a foundation of quality, innovation, and customer satisfaction. With a comprehensive product lineup, a commitment to safety and compliance, and a focus on customer support, Duravent continues to be a driving force in shaping the future of venting solutions for heating systems, offering products that elevate the efficiency, safety, and aesthetics of residential and commercial spaces.


Q: Is DuraChimney II suitable for both residential and commercial applications?
A: Yes, DuraChimney II is designed for both residential and commercial heating systems.

Q: What fuel types can DuraChimney II accommodate?
A: DuraChimney II is versatile and can accommodate wood, oil, coal, and gas-burning fireplaces.

Q: Does DuraChimney II require field assembly during installation?
A: No, DuraChimney II features a unitized, lightweight design that eliminates the need for field assembly of pipe sections.

Q: What is the clearance requirement for DuraChimney II to combustible materials?
A: DuraChimney II requires a minimum clearance of 2 inches to combustible materials.

Q: Can DuraChimney II be used with masonry fireplaces?
A: Yes, DuraChimney II is specifically designed for use with masonry fireplaces.

Q: What are the available diameters for DuraChimney II?
A: DuraChimney II is available in diameters of 10″, 12″, 14″, and 16″.

Q: Is there a maximum number of offsets allowed in a DuraChimney II installation?
A: Yes, a maximum of two offsets (four elbows) is permitted in a single DuraChimney II installation.

Q: What is the temperature resilience of DuraChimney II?
A: DuraChimney II is tested for continuous operation at 1000°F, one hour at 1400°F, and ten minutes at 1700°F.

Q: Can DuraChimney II be installed in an enclosed chase?
A: Yes, DuraChimney II can be installed in an enclosed chase for enhanced safety and aesthetics.

Q: Are there different elbow options for offset installations?
A: Yes, DuraChimney II offers 15° and 30° elbow options for offset installations.

Q: What is the purpose of Elbow Straps in DuraChimney II installations?
A: Elbow Straps are used to provide adequate support in offset installations of DuraChimney II.

Q: What is the minimum recommended chimney height above the roof line for DuraChimney II?
A: The minimum recommended chimney height is calculated based on building codes and must be at least 3 feet above the roof penetration.