CBI: Single wall positive pressure vent

Boiler Chimney Liners

  • UL Listing: UL 1777, ULC S635
  • Application: Building heating appliance
  • Boiler Category: 1, 3
  • Operation Temperature: 570°F Continuous
  • Inner Wall: 304, 316
  • Inside Diameters: 6"- 48"
  • Male/female slip-type jointing system
  • Laser welding
  • Stainless steel material
  • Industrial, institutional and commercial application


The CBI Industrial Positive Pressure model is a single-wall stainless steel liner.  CBI liners are suited for industrial, institutional and commercial applications.


  • Product Overview
  • Related Resources
  • Applications
  • Male/female slip-type jointing system
  • CBI and inner wall standard 316L or 304 2B stainless steel (20 - gauge 6" to 40" diameter, 18 ga 42” to 48”)
  • Full range of accessories including elbows, fittings guides and supports
  • Laser welded
  • Easy to assemble
  • Complete engineering
  • UL/ULc listed


CBI chimney liners are intended for use in masonry chimneys to vent Category I & III gas and oil fired appliances equipped with draft hoods and appliances intended for use with type B gas vents.


Basics of Boiler Venting for Safe Operation →

This webinar will cover the types of venting categories for condensing and non-condensing boilers and the requirements that need to be met for each., and pursued independence from local electrical grid.

Minimize Draft Loss Through Proper Exhaust System Design →

In this advanced venting webinar, attendees will learn about draft calculations and economizer considerations for single-boiler layouts and common venting.

Stack Installation Video →

  • Process Steam
  • Industrial Process
  • Building Heat
  • Hospital and Healthcare
  • Power and Utilities
  • Refineries and Petrochemical
  • Humidification
  • Laundry and Dry Cleaning
  • Waste Heat Recovery