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Security Chimneys Secure Black 7CA ASHT Flue Extension with Coupling (old 7UP)

Security Chimneys Secure Black 7CA ASHT Flue Extension with Coupling (old 7UP)

Regular price $107.23
Regular price Sale price $107.23
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Since starting operations in 1960, Security Chimneys International has built a reputation as one of the most trusted suppliers of quality chimneys in North America. Our dedication to total quality lives in the research and development of new products and services for the residential and commercial markets. With a 104,800-square-foot manufacturing facility in Laval, Quebec, we are fully equipped and accredited to certify that all our products are in accordance with UL and ULC standards.
Throughout our history, our product offerings have evolved. We’ve strengthened our focus on maintaining our leadership position in the industry by designing, building, and marketing a complete line of chimneys for residential and commercial applications that have set the standard that other manufacturers have often imitated, but never equaled.

Ultimately, Security Chimneys International believes that quality relationships develop quality products. We have developed valuable partnerships by providing superior sales support, customer service, and products. But most of all, we’ve fostered an environment where customer focus is the key to our success.

Why Choose Security Chimneys?

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Secure Black® Double Wall

The Secure Black Double Wall (DL) stove pipe from Security Chimneys is tested to 2100°F and listed as 6” clearance from combustible materials for all types of wood-burning stoves. The double-wall black stove connector features a series of openings, allowing for maximum recovery of heat from flue gases.


For over 50 years, Security Chimneys has been an innovator in the venting field and a market leader in North America. Instrumental in the company’s growth has been an ongoing focus on product improvement and the introduction of new, innovative products. The proven Secure Black Double Wall pipe is just one example of this commitment to engineering solutions that outperform.


With the Secure Black® Double Wall (DL) pipe, Security Chimneys has designed a product that has been successfully tested to 2100°F at a 6-inch clearance from combustible materials. This level of safety delivers the peace of mind your customers demand. Temperature rating of 1000°F Max continuous; 1400°F brief forced fired; and 2100°F 30 minutes tested. The inner liner is made of corrosion-resistant stainless steel, helping to deliver better protection of the exterior finish. The outer wall features a series of openings that allow for maximum recovery of heat from the flue gases. In fact, it is almost as efficient as a single wall black pipe.


The Security Double Wall black stove pipe can be safely installed as close as 6 inches to combustible materials, providing greater installation flexibility. Furthermore, it may be used with all types of stoves and is available in diameters of 6, 7, and 8 inches. To simplify installation, Security Chimneys has designed a telescopic double wall black pipe, which extends from 3-1/2 feet to 5-1/2 feet. There is no need to determine the number of lengths required and no need for cutting—it will adjust to your application.


Security Chimneys Ltd. warrants a limited lifetime warranty for its double wall black stove pipe.




  • Exclusive twist-lock assembly.
  • Stainless steel inner lining.
  • The painted black finish is compatible with most stove finishes
  • The telescopic design extends from 3-1/2 feet to 5-1/2 feet.
  • No screws or other attachments are required.
  • Fast and easy installation with 1/8-inch turn.
  • Enhanced corrosion & heat resistance for lifetime performance.
  • Allows for maximum recovery of heat from the flue gases.
  • Provides low surface temperature.
  • Adjusts to the application.
  • No need for predetermined lengths.
  • No need for cutting.
  • Assures product confidence and peace of mind.


*Use to connect stovepipe to ASHT Chimney.



Model 7CA
Piece/carton 10
Style Double Wall
Tested to 2100°F
Combustible Clearance 6"
Dimensions 7" (A) x 3" (B) x 6.875" (C)
Listings Standard UL-641
Canada / U.S
Warranty Limited lifetime warranty



DL-Cathedral Ceiling Installation

DL-Straight Installations

DL- Through the wall installation



California PROP 65: This product can expose you to Lead & Chromium, which is known to the State of California to cause cancer and birth defects, or other reproductive harm. See WARNING

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