Chimney Catchment Space; Brick Built Chimney - Flavel Firenza FFIRR0MN Installation And Maintenance Instructions Manual

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
during and after the smoke pellet test.
With 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
proceeding 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
chimney 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 general 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
possible, 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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