Homesaver UltraPro is a flexible stainless steel chimney liner suitable for wood, coal, oil, pellet, and non-condensing gas (within the guidelines for light liners). We recommend you study the installation instructions to become familiar with the product. Follow manufacturer recommendations whenever applicable. Never use a chimney liner that is smaller in diameter than the flue size of the appliance it is being connected to. Not what you're looking for? See all 6" chimney liner. Homesaver UltraPro Installation Instructions