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Selkirk 6" x 24" UltimateOne Chimney Pipe Length

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The Selkirk 6" x 24" UltimateOne Chimney Pipe Length 6U1-24 is an innovative development in chimney technology that raises the bar for performance and safety. Here is a deeper look at the main characteristics that distinguish it as the best option:

1. Thermal Resilience: The Thermal Reduction Spacer used in the construction of the UltimateONE Chimney System ensures that it can withstand thermal expansion without buckling, even in the case of a chimney fire. Additionally, significantly reducing heat transmission at the joints, this novel innovation raises overall safety.

2. Seamless Strength: The UltimateONE Chimney is distinguished by its continuous-welded seams, which offer unrivaled strength and guarantee that moisture never seeps into the insulation. This seamless design ensures dependability and durability under all circumstances.

3. Simple Assembly: Ditch labor-intensive setups. In the UltimateONE Chimney System, each insulated length, tee, and elbow has a simple latch-style locking band. Lock the parts together for an exact fit without the need for any tools.

4. Creosote Control: Every chimney junction has a seamless barrier against cold air penetration, thanks to UltimateONE's integration of insulation-to-insulation contact. Creosote generation is significantly decreased by this clever design, lowering the possibility of chimney fires and creating a safer atmosphere.

5. Premium Stainless Steel: The exterior casing and inner liner of the UltimateONE Chimney System are made of superior 304 stainless steel, providing unrivaled corrosion resistance. We now give a 316 internal material option in 6" diameter combinations for enhanced durability in severe settings.

6. Maximum Insulation: Our solid-pack insulation combines performance and safety. With a full inch of insulation, The UltimateONE Chimney offers superb insulating qualities and outstanding fire prevention. This novel solid-pack design maintains low exterior temperatures to increase safety while maintaining high flue temperatures for best performance.

Experience the future of chimney systems with UltimateONE. This pioneering solution combines cutting-edge technology, unrivaled safety, and excellent performance.


  • 304 Stainless Steel Inner Liner
  • 6" also available in 316 Stainless Inner Liner
  • 304 Stainless Steel Outer Wall
  • All residential fuels
  • 1" Solid Pack Superwool Insulation
  • Adjustable lengths for ease of installation
  • Multiple Support Kits available
  • Smart Choice Warranty on all components

*Each length includes a Latch Locking Band.


 Pipe Inside Diameter:  6"
 Length:  24-Inch
 Material:  Stainless Steel
 Fuel Type:  Coal, Oil, Wood
 UL Listed:  UL-103
 Available:  6" diameters
 Pipe Type:  Chimney Pipe


Introducing The Selkirk UltimateONE: The Pinnacle of All-Fuel Chimneys

Selkirk UltimateONE is a groundbreaking innovation in the realm of hearth technology, designed to meet the demanding needs of professionals in the industry. This factory-built chimney system offers a combination of superior performance, unmatched durability, and top-tier safety, making it the ultimate choice for those seeking excellence in chimney design.

The Core of the Selkirk UltimateONE's Excellence:

304 Stainless Steel Construction: UltimateONE boasts an inner liner and outer casing crafted entirely from all-welded 304 stainless steel. This choice of material not only ensures superior strength but also delivers exceptional corrosion resistance. Regardless of the harsh conditions it may face, UltimateONE stands strong, providing years of reliable service.

Innovative Superwool Insulation: A standout feature of UltimateONE is its state-of-the-art web coupler design. It incorporates a full 1" layer of Superwool insulation that intimately contacts at the seams, forming an unbroken column of protection. This insulation is not only highly effective in safeguarding against extreme temperatures but also minimizes cold air infiltration, thereby maintaining a comfortable and efficient heating system.

Tool-Free Installation: One of the key advantages of UltimateONE is its no-tool installation process. Thanks to a latch-type locking band, this chimney system can be assembled quickly and effortlessly, all while ensuring a solid and secure fit each and every time. Professionals can save valuable time during installation, making it an efficient and hassle-free process.

Diverse Diameter Options: UltimateONE is available in 6" to 8" diameters, providing flexibility to suit various heating system needs. It offers a 304 stainless steel inner liner, with an option for 316 stainless steel in the 6" diameter range. This adaptability ensures that UltimateONE can be customized to match the specific requirements of residential projects.

All-Fuel Versatility: UltimateONE's design is not limited to a single fuel type. It is engineered to accommodate all residential fuels, making it a versatile choice for a wide range of heating systems. This adaptability simplifies the selection process and ensures that UltimateONE can meet the needs of various customers.

Ease of Installation: UltimateONE is engineered for ease of installation. It comes with adjustable lengths, simplifying the setup process and accommodating varying chimney heights and installation environments. Additionally, multiple support kits are available, providing professionals with the necessary tools to secure the chimney in place.

Smart Choice Warranty: For added peace of mind, UltimateONE offers the Smart Choice Warranty, covering all its components. This warranty reflects confidence in the product's durability and performance, assuring professionals and homeowners alike that they are investing in a chimney system that will stand the test of time.

UltimateONE is the epitome of excellence in the world of all-fuel chimneys. With its 304 stainless steel construction, innovative Superwool insulation, tool-free installation, and all-fuel versatility, it offers a superior solution for heating system professionals and homeowners alike. Whether for new construction or retrofitting existing systems, UltimateONE sets the standard for performance, durability, and safety in chimney design.


Selkirk Support Structures are precisely engineered with the capability to handle up to four times their maximum specified system weight at its maximum allowed height.
Framing Table

Chimney Height Above Roof Guidelines:

Rule 1: The section of the chimney that meets the roof must rise a minimum of 3 feet above the roof's highest point.
Rule 2: Any segment of the chimney within 10 feet horizontally from a roof structure or surface must extend at least 2 feet above.

Step 1: Multiply the roof's pitch section by the distance in feet from the peak.
Step 2: Add 24 inches to the calculation result to comply with requirement #2.
Step 3: Determine the necessary chimney height to surpass the roof line.

Please note: The measurements highlighted in blue have been adjusted to 36 inches to comply with requirement #1.
According to regulations, the chimney needs to extend a minimum of three feet above the highest point where it traverses the roof surface. In addition, it should be at least two feet taller than any part of the building within a horizontal span of ten feet.

Selkirk Corporation, ("Selkirk", "we", "us", "our") warrants our residential Chimney & Venting products (* defined below) to be free from defects in material and workmanship.

For products installed after January 1, 2009, for a period of Ten (10) years from original installation, we will provide replacement product with a similar or like quality of available Selkirk product, free of charge, excluding any installation costs.

From the Eleventh (11) through Fifteenth (15) years, we will provide replacement product at a cost of 75% off the published Retail Price in effect on the date the claim is received, excluding any installation costs.

At expiration of the Fifteen (15) year term, we will provide replacement product at a cost of 50% off the published Retail Price in effect on the date the claim is received excluding any installation costs. This warranty coverage is non-transferable and applies exclusively to the original consumer.

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Last updated on March 23rd 2024.



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