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Secure Stack® Pro

Secure Stack Pro

The Secure Stack Pro Series, Models SCL, CAX1, CIX1, CIX2, CIX4, and CIX3Z venting systems are designed to offer the ultimate in installation convenience and versatility for a variety of applications. Certified for commercial chimney and diesel exhaust applications, they are constructed of thick-gauge material for the inner pipe that provides a strong and rigid assembly. Featuring a self-centering flue extension design that significantly simplifies and accelerates the installation process.

Available in sizes from 5″ to 36″ diameters, the CIX line offers double-wall configuration with a choice of 1″, 2″, 4″, or 3″ insulation and the CAX line offers a 1″ air insulated product. For premium corrosion resistance and durability, the inner flue is constructed from 0.035″ thick 304 or 316 Stainless Steel. This is coupled with a 0.024″ thick 304 Stainless Steel or Galvalume (Aluminum-zinc coated) steel outer casing. The CIX line features the highest-quality insulation, densely packed to ensure low heat loss and maximum draft.

Standard Features

  • Thick-gauge 304 or 316 stainless steel inner liner that provides a strong and more rigid assembly.
  • Outer casing available in 304 or galvalume.
  • Centering flue extension that simplify installation in any direction.
  • Modular design assembles quickly with common tools.
  • Available in sizes from 5″ to 36″ diameters.
  • 1-year and 15-year limited warranty options available.

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Secure Stack Pro is available in the following configuration:
SCL: Single Wall
CAX1: 1″ Air Insulated
CIX1: 1″ Insulated
CIX2: 2″ Insulated
CIX4: 4″ Insulated
CIX3Z: 3″ Insulated

Applications include: Low and High-Pressure Steam Boilers; Diesel and Turbine Exhaust; Building Heating Equipment. Industrial Furnaces; Processing Equipment; Kilns and Ovens; Grease Duct.

Materials and Construction

Inner Wall Material Thickness
5” – 18” .035” Laser welded, 304 or 316
20” – 36” .035” Plasma welded, 304 or 316

Outer Wall Material Thickness
5”- 12” .024” Laser welded, 304 or Galvalume
14”- 36” .024” Pittsburg Lock, 304 or Galvalume





UL 103 – Building Heating Appliance
UL 103 (HT) – Standard for Factory-Built chimneys for residential type and building heating appliances
UL 1978 – Standard for Grease Ducts
UL 2221 – Standard for tests of fire resistive Grease Duct enclosure assemblies. CIX3Z only
UL 2561 – Standard for 1400°F Factory- Built Chimneys. Excludes CIX3Z
UL 1777 – Standard for Chimney Liners. SCL only


ULC/ORD C959 – Chimneys, Industrial 540°C and 760°C
ULC S604 – Standard for Factory-Built Type A chimneys
ULC S662 – Standard for Factory-Built Grease Duct
ULC S635 – Standard for lining systems for existing masonry or Factory-Built chimneys and vents.

Product Literature