suitable stainless steel flue liner. Where a masonry
chimney is not available a proprietary type 150mm
twin wall, fully insulated pipe may be used. The pipe
must terminate at a point not lower than the main
ridge of adjacent outside obstructions. With such
installation, access to the chimney must be provided
for cleaning purposes. (See Fig.1)
When flue piping passes through a closure plate
with a sliding door, ensure that the pipe continues
up and is ultimately connected to the flue liner and
well sealed with fire cement.
TOP FLUE EXIT
For the top outlet configuration, remove the blanking
plate (part no.10) from the hob, remove the flue
spigot (part no.11) from the back plate and fix it to
the hob. Fix the outlet blanking plate to back plate
(see Fig. 2). Push the flue outlet connector pipe (not
supplied) into the flue spigot and cement into place
using approved fire cement, ensuring that no
cement is blocking the flue passageway.
REAR FLUE EXIT
Push the flue connector pipe (not supplied) into the
flue spigot and cement into place using approved
fire cement ensuring that no cement is blocking the
flue passageway.
Fig.2
Fig.3
Pitched roof not exceeding 45
o
showing external and
internal flues and ridge termination
DOWN DRAUGHTS
However well designed constructed and positioned,
the satisfactory performance of the flue can be
adversely affected by down draught caused by near-
by hills, adjacent tall buildings or trees. These can
deflect wind to blow directly down the flue or create
a zone of low pressure over the terminal. A suitable
anti-down draught terminal or cowl will usually effec-
tively combat direct down blow but no cowl is likely
to prevent down draught due to a low pressure zone.
(See Fig.4)
Direction of wind
Direction of wind
Direction of wind
Pressure zone
Pressure zone
Suction zone
Suction zone
Pressure zone
Suction zone
Fig.4
4
2300 min
1000
min.
1000
min.
