Class 1 flue liners:
A Class 1 flue liner (or solid fuel flexible liner) is a twin skin flexible flue liner suitable for appliances burning wood, solid fuel and heavy oil.
Our Class 1 flue liners are made from either 316L grade stainless steel or 904L grade stainless steel (carrying a 10yr and 25yr conditional warranty respectively).
Class 2 flue liners:
A Class 2 flue liner is a single wall flexible flue liner and is suitable for appliances burning gas or 28 Second Oil (Kerosene), where the temperature does not exceed 260°C.