Flexible chimney liner system design, insulating your chimney liner

Insulating your chimney liner is very important especially if your are burning wood.

Chimney fires are caused by tar deposist in your chimney.
Tar deposits when the flue gases cool
Wood smoke has a lot more tar in than coal
By insulating your chimney liner you reduce the amount of tar deposist in your chimney thus reducing the risk of chimney fires.
The chimney will also draw better.