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INSTALLATION
21
4.1 Before using any existing chimney or refitting a gas appliance,
it is vital to check that the chimney is safe. Oversized,
leaking or rough chimneys can be inefficient and dangerous.
4.2 There are two basic existing types of chimney re-lining product
suitable for use with gas appliances. It is most important that
the chimney is swept and thoroughly cleaned before
installing a liner so as to remove previous combustion
deposits, which have the potential to damage the liner.
Flexible Stainless Steel.
4.3 Recommended where any existing chimney is to be used for
a gas-fired appliance. Flexible stainless steel liners must be
certified to BS 715. When replacing an existing appliance
connected to a chimney lined with a metallic liner, the liner
should be replaced.
Rigid Stainless Steel Flue Pipe
4.4 Type 316 or 304 stainless steel, not less than 0.55 mm thick.
Flue Pipes.
3.7 These should only be used to connect a gas burning appliance to
one of the types of chimney previously mentioned. Any flue
type serving a gas appliance must be kept clear of any
combustible materials including any materials likely to be
located near the installation by the householder. The
minimum air gap clearance that must be maintained is 25
mm (1'').
Flue pipes may be constructed from the following materials.
3.8 Sheet metal as described in BS 715 stainless steel flue pipe,
cast iron flue pipe as described in BS 41, any flue pipe
material described in the Building Regulations relating to flue
pipes suitable for solid fuel and oil burning appliances. All
flue pipes should be constructed such that any condensation
is retained by the flue pipe system. Systems with spigot and
socket joints must be fitted with the sockets uppermost.
4. LINING OF EXISTING CHIMNEYS
Rain Cap
(Approved for
gas use)
Cement Mortar
Plate Clamp
Brick Chimney
Stainless Steel
Flexible Flue
Liner
Back fill with Vermiculite
Insulation or similar
Bends must be no less than 135°
Vitreous Enamelled Steel or
Stainless Steel with Cleaning
Cover
Seal Liner
into Flue Socket
with Fire Cement
MIN RISE
BEFORE BEND
=600MM
MIN EFFECTIVE HEIGHT=3M
COVENTIONAL BRICK CHIMNEY WITH LINER