Security Secure Temp 6-Inch Inner Diameter All-Fuel Stainless Steel Chimney Pipe - 36-Inch Length

Security only offers the ASHT+ as their UL103-listed chimney system in the U.S. with ASHT standing for "All Stainless High Temperature." This is simply the branding given to this particular UL103 chimney system offered by Security and choosing this brand of chimney would purely be a preference when installing a wood stove or hearth stove that calls for UL103-listed class A chimney of a given diameter. You could also choose Simpson DuraVent's DuraTech or Selkirk's SuperVent as your chimney system of choice all share the same product listing. The only occasion where the brand of UL103-listed chimney would not be a choice is when installing certain brands of high-efficiency EPA fireplaces a.k.a. Hearth Stoves or Built-In Stoves that are only tested with a specific brand of UL103-listed chimney.

This is indeed the ASHT+ chimney.

The floating flue technology that is referenced is in regards to the construction of the inner chimney wall. The inner wall is made in such a way that it allows several inches of vertical expansion when heated. In the event of a chimney fire, the flue is able to "float" vertically and contain the fire within the inner wall. In some brands that are completely rigid and allow limited vertical expansion, a chimney fire can cause the chimney sections to break loose at each juncture, allowing the fire to potentially spread.