Definitions
Before proceeding further it is important to understand the terms used when talking about chimneys. These are briefly as follows:
FLUE – The flue is the void or passageway through which the products of combustion are removed from the fire to the outside.
CHIMNEY – A chimney is the structure surrounding one or more flues.
FLUE LINER – The flue liner is the material used to form the flue or flues within a chimney.
CHIMNEY TERMINAL – This is the pot, cowl or other method of finishing the top of the chimney.
FLUE PIPE – is a metal pipe used to connect an appliance to the flue in a chimney.