Chimney and Flue types
The type of chimney or flue you have usually dictates your
choice of fire.
To help you understand which fires are suitable for your home,
please use the information on this page to identify your
Don't worry if you don't have a chimney though, you can still
find the perfect fire for your home.
Chimney and Flue types suitable for each appliance is referenced
on the relevant product page.
Brick/Stone Chimney (Class 1)
Conventional chimneys are easily recognisable. the stack rises
well above the roofline and is topped by a traditional chimney pot
or gas terminal. This type of chimney relies on the natural
circulation of heated air to expel the products of combustion up
Pre-fabricated Flues (Class 1 & 2)
You will see a metal flue cowl on your roof. Some are all metal
whilst others may terminate through a short rectangular pot (but
without a chimney stack). These flues create the same circulation
of heated air as a brick or stone chimney.
Pre-cast Flue (Class 2)
Many modern homes have been built with such flues. You can
readily identify them by either a metal flue cowl or a raised ridge
terminal on your roof. The natural circulation of heated air expels
the products of combustion.
These flues tends to be very shallow in depth so a slimmer fire
is often required. Deep appliances however may be able to be
installed with the use of either a spacer kit or deeper rebate into
Balanced Flue (No chimney required)
Balanced flues work in conjunction with glass fronted gas fires.
The appliance is completely sealed from the room into which it is
installed (so there are no draughts and heating efficiency is
increased) and a twin-wall pipe vents directly to an outside
Air for combustion is drawn in through the outer pipe whilst the
inner pipe removes the combustion gases to the exterior of the
Depending on the fire selected, the twin-walled pipe may exit
horizontally through an external wall or vertically through the
roof. No electric supply is required; therefore there is no sound
with a balanced flue system.
Powered Flue (No chimney required
This works by coupling our externally driven flue system to the
fire so that it expels the products of combustion through a flue to
the outdoors. You can have up to three bends in the flue so the
fire can be located in more rooms around your home. The fire does
not necessarily have to be installed on an external wall.
Electric Fires (No chimney required)
Gazco produce a selection of electric fires which do not require
a chimney or flue of any kind.