The area in which the fire is contained. Can be constructed in either
masonry or steel and can be lined with suitable glazed tiles to enhance
The air corridor along which the combustion gases and smoke move up
and out to atmosphere. The term chimney refers to an air corridor constructed
in brick/masonry and ?steel flue? is the same constructed in stainless
steel. Each type has it?s benefits and disadvantages.
The area where the Combustion Chamber converges to the Flue.
Terminal A device that diverts adverse air currents that would
otherwise create downdraft. Also assists in maintaining a more consistent
heat and pressure value in the flue contributing to greater efficiency
in performance. Eliminates necessity of ?smoke shelf? and of elevating
chimney height to ?ridge? or ?above ridge?. Reduces likelihood of roof
staining and water contamination. ( ie where water is collected for
A steel plate mounted to open in a regulated fashion so as to regulate
updraft where flue sizes have been over designed. Also beneficial in
sealing off unwanted drafts or insects when fireplace is not in use.
Screen Constructed in stainless mesh usually of 1.6mm in a
suitable frame located in the transition area.
grate& Tray Appropriate to the extent that a chamber can be
built of conventional brick or masonry materials and will not deteriorate
providing the fire grate is appropriately constructed. The tray allows
for easier housekeeping
of Chimney / Steel Flue
The flue should always be constructed or installed in a straight vertical
manner avoiding bends or curves wherever possible. Even thought the
breast may be constructed of masonry materials,the use os a stainless
steel liner is advised as this would optimise the safety features in
respect to a flue fire and protect the chimney.In respect to flue configuration,
whether it be steel or masonry. The most efficient flue is a round one.
A square or rectangular flue corridor would be the alternative in masonry
construction. Avoid building an oblong section. Where fireplaces are
on an outside wall and roof pitch is below 35 degrees,the height of
chimney/flue is 1 metre (3 feet) above roof line which has nothing to
do with the ridge height.
The area as shown in diagrams reduces the volumetric area of the fire
chamber by eliminating the corners and promoting better heat radiation
into the room. Final design should be with anticipation of Fire grate
and Tray being present. If Fire grate is not to be used in a masonry
/ brick chamber then it is recommended that the back wall have a steel
liner to guard against deterioration. The protective steel plate is
otherwise incorporated into the fire grate design.
A protruding mantle as shown will serve to circulate warm air and protect
hangings or artifacts above fireplace. A recessed mantle will only promote
dust ?dumping? on any artifacts or hangings above fireplace.
A fireplace must have a pleasing presence when not in use. As a fire
grate commands focal attention it is important that appropriate attention
be given to its design beyond function. A well designed fire grate will
not only enhance the visual aesthetics but also promote greater efficiency
Fire grate construction
should be of 12mm plate steel.(minimum)
Tray is usually of 0.8mm galvanised or 0.5mm stainless steel. Tray/s
should be such that their removal is to be free and independent of the
fire grate. Removable grate insert has holes no more than 10mm (3/8?)
so as that ash can fall through to the tray below.