Security Chimneys


The Secure Stack CIX and CAX venting systems are designed to offer the ultimate in installation convenience and versatility for a variety of applications. Certified for commercial chimney, grease duct (CIX only) and diesel exhaust applications. Thick-gauge material for the inner pipe and coupling provides a strong and rigid assembly. Self-centering flue design significantly simplifies and accelerates the installation process. Coupling configuration (patent pending) requires only one locking band and the use of a regular, less expensive, high-temperature silicone sealant.


Security Chimneys has been an innovator in the venting field and a market leader in North America since 1960. Instrumental in the company’s growth has been an ongoing focus on product improvement and the introduction of new, innovative products. The CIX and CAX venting systems are prime examples of our constant quest for more cost-effective, versatile and reliable product solutions.


Available in sizes from 5- to 36-inch diameters, the CIX line offers double-wall, 2-inch insulated chimneys, and the CAX offers a 2-inch air insulated product. For premium corrosion resistance and durability, the inner flue is constructed from 0.035-inch-thick Stainless Steel 304 or 316. This is coupled with a 0.018-inch-thick Stainless Steel 304, 316 or Galvalume (Aluminum-zinc coated) steel outer casing. The CIX is lined with the highest-quality insulation, densely packed to ensure low heat loss, maximum draft and a 1-inch clearance to combustible materials.


The couplings are completely welded to the inner flue pipe for reinforced strength and to help prevent leakage. These male and female couplings then extend the inner pipe up to the outside and allow sealing of the inner flue at the exterior of the pipe. This greatly reduces the temperature at the locking/sealing location so a more conventional and less expensive high- temperature silicone can be used.
Plus, only one locking band is necessary as opposed to the two required for competitive products.

  • The CIX, with its 2″ densely packed insulation, and CAX, with 2″ of air, ensure low heat loss and maximum possible draft
  • CIX: certified at 1″ clearance to combustibles and 2″ for grease ducting applications; CAX: certified at 4″ clearance to combustibles
  • Thick-gauge 304 or 316 stainless steel inner liner provides a strong and more rigid assembly
  • Patented self-centering assembly system combined with low weight simplifies and accelerates installation
  • Coupling configuration requires only one locking band on outside of pipe and the use of a regular, less- expensive high-temperature silicone sealant
  • Outside casing available in 304 or 316 stainless steel as well as Galvalume® (Aluminum-zinc coated) material for a lower-cost option
  • Available in sizes from 5″ to 36″ diameters
  • Complies with the following:
    • UL-103 60″ WC positive-pressure and 1400°F building heating appliance chimney standard
    • ULC-ORD959 and ULC-S604 chimney standards
    • UL-1978 for grease duct applications.
  • 1-year and 15-year limited warranty options available

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CIX – Boiler applicationCIX – Diesel application
CIX - Boiler applicationCIX - Diesel application