Smoothcore series liners are 2-layer type, comprised of a smooth wall inner core and standard corrugated outer jacket for added strength.
A smooth liner wall improves draft, allows for easier condensate drainage and reduces accumulation of soot and creosote, making is a superior option over standard single-wall chimney liner.
As with standard stainless steel chimney liner, Smoothcore also has to be insulated if used for wood-burning applications.