Flue Types & Terminology

Flue information should be used as a guide only. A professional fireplace survey is recommended prior to purchase/installation.

Chairbrick		Power Flue
Tapered firebrick fitted in fire opening with a Class I Chimney.		Radiant or Convector fire for use in situations where no chimney is available and products of combustion are extracted by means of a fan.
Class I Chimney		Balanced Flue
Chimney suitable for solid fuel or gas fires. Normally masonry built with a clay or similar liner - minimum 175mm diameter.		Where no chimney or flue is available. The fire vents directly outside through a horizontal twin wall pipe. These fires are glass fronted. No mains electricity is required.
Class II Chimney		N.V.
Chimney suitable for gas only. Can be proprietary flue blocks or gas flue pipe with a minimum diameter of 125mm.		No Vent - subject to a satisfactory 'spillage test' carried out by the installer, additional room ventilation is not required.
Inset Fire		Saftey Device
Fire designed for use with chairbrick - consists of burner tray, ceramics or gas dispersal medium and fuel bed.		All fires are fitted with an oxygen depletion sensor which will switch off the fire if the flame goes out or if the oxygen level in the room drops below a recognised safe level.
Convector Fire		Radiant Fire
Box fire incorporating a heat exchanger giving radiant and convected heat.		Ceramic lined box fire giving radiant heat only.
Flueless Fires
No Chimney or Flue. Uses modern catalytic converter technology.