Isokern Flue ranges are manufactured from pumice which has natural insulating properties. This is the unique property that separates pumice from all other chimney materials.
Pumice allows the flue gases in the chimney to quickly reach their optimum temperature enabling the heating appliance to reach its optimum performance shortly after lighting.
It also keeps the chimney warmer longer as the heat output of the appliance decreases – once again aiding performance and reducing the likelihood of condensation and soot build-up.