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SECTION 05
Older editions of BS1289 required a cross-sectional area of 13,000mm2.
The current revision of the standard requires 16,500mm2.
The current versions of BS1289 and BS EN 1806 recommend that there should be an air
space or insulation between the flue blocks and the plaster because heat transfer may
cause cracking on directly plastered flues.
However, generally this appliance is suitable for installations under all circumstances
unless there is a history of cracking problems, remember that faults such as cracking
may be caused by poorly built and restrictive flues, e.g. mortar extrusions, too many
bends, flue heights below three metres, restrictive terminations, etc.
Any existing draught device situated under the fireplace must be sealed off.
The opening area must be non-combustible.
The appliance requires a hearth with non-combustible surface of at least 300mm in
depth and 12mm thick.
The top surface must be at least 50mm above the surrounding flooring level, or be
surrounded by a raised edge or fender 50mm high.
To enable the product of combustion to be cleared properly up the flue, the outlet at
the back of the appliance must have a 50mm minimum clearance between it and the
back wall of the opening or any other obstruction.
The area immediately above the outlet must form a smooth path into the flue.
The fireplace or builders opening must be reduced to suit the appliance both side to
side and the full depth of the appliance, a decorative back panel i.e. marble, granite
etc must not be used as a closure plate for the appliance please see below.
Any type of fire surround used with this appliance must be adequately sealed to the
wall and floor; a combustible shelf may be fixed to the wall above the fire, providing
that it complies with the dimensions given below.
From Hearth to Underneath of Shelf with a depth of 150mm is 766mm add 12.5mm in
height for every 25mm increase to the projection of the shelf depth.
Any combustible side walls must be at least 500mm to the side of the radiant heat
source.
As with all heating appliances, any decorations, soft furnishings, and wall coverings (i.e.
flock, blown vinyl and embossed paper) positioned too close to the appliance may
discolour or scorch.
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