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Secure Stack® Pro

Secure Stack Pro

The Secure Stack Pro Series, Models CIX1, CIX2, CIX4, and CAX1 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″ or 4″ 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, 441 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. CIX1: 1″ insulated.
CIX2: 2″ insulated
CIX4: 4″ insulated
CAX1: 1″ air 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 441, Galvalume
14”- 36” .024” Pittsburg Lock, 304 or 441, Galvalume




UL 103, 60-in. Positive Pressure and 1400°F Building Heating Appliance Chimney.
Type HT listing, for solid fuel application (only for Models CIX1, CIX2, CIX4, for diameter 5″to 24″).

ULC/ORD C959 540°C (1000°F) and 760°C (1400°F) rating.
ULC S604, Type A chimney.

Product Literature