Does the exterior of the liner get hot?

The K5A6 insulated liner kit is UL listed for installations that require an insulated liner. This includes masonry chimneys without clay flue tiles or where the clay flue tiles are damaged or otherwise compromised. An exact temperature of the outside the liner is not provided by the manufacturer. If you have any further questions or need further assistance, please feel free to reach out to one of our experienced customer service representatives and they would be happy to assist you. Thank you and have a wonderful day.