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b)
Brick / stone built chimneys and any chimney or flue which has been
used for an appliance burning fuel other than gas must be thoroughly
swept. The base of the chimney/flue must also be thoroughly cleared of
debris etc.
Any under floor air supply to the fireplace must be completely sealed off.
Ensure that the inside of the chimney/flue is in good condition along its length and
check that there is no leakage of smoke through the structure of the chimney dur-
ing and after the smoke pellet test.
W
ith pre-cast flues it is especially important to check the inside of the flue
for extruded Cement / sealant protruding from the joints between the flue
blocks. If present, these should be removed by rodding the flue before pro-
ceeding with the installation.
Using a smoke pellet, check that there is a positive up draught present in the
chimney / flue and that the smoke can be seen issuing from the terminal / chimney
pot outside. There must be no leakage of smoke through the structure of the chim-
ney during or after the smoke pellet test and it is important to check inside upstairs
rooms adjacent to the chimney / flue. Check the chimney pot / terminal and gener-
al condition of the chimney brickwork or masonry. If the chimney or flue is in poor
condition or if there is no up draught do not proceed with the installation. If there is
a history of down draught conditions with the chimney / flue, a tested and certified
flue terminal or cowl suitable for the relevant flue type should be considered.
A
spillage test must always be carried out during commissioning of the
appliance.
1.8 CHIMNEY CATCHMENT SPACE.
1.8.1 Brick Built Chimneys.
The catchment space below the flue spigot should be as deep as possi
ble, and must not be less than 250mm measured from the bottom of the
flue spigot to the bottom of the catchment space, or to the top of any
“bricking-up” of the fireplace, whichever is the least. See Fig. 1.
The flue spigot must pass through the closure plate at least 25mm and
have a minimum clearance of 50mm between its open end and the
nearest obstruction. There must be a minimum clearance of 165mm
between the back of the closure plate and the back of the catchment
space. See Fig. 1 overpage.
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