A conventional brick chimney is recognisable by a chimney stack with a terracotta pot or gas terminal.
This is an interlocking metal flue tube system, identifiable by a metal flue and terminal on the roof and a metal flue box behind the fire.
Balanced Flue fires vent directly outside through a horizontal co-axial pipe (one pipe within a larger pipe). The outer pipe draws air in from the outside and the inner pipe expels combustion gases.
Built from concrete or clay blocks, pre-cast flues provide a rectangular section flue. They can be identified by a ridge vent or metal flue tube and terminal on the roof.
No Chimney or Flue
If you do not have a chimney/flue and do not want to install a balanced flue or Powerflue product then an electric fire may be the best option for you.
Powerflue fires expel the combustion gases directly outside the building through the use of an electronically driven fan unit mounted on the external wall. A sophisticated microprocessor monitors performance and automatically shuts off the fire in the unlikely event of a failure.