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Installation
For flue runs with the intak e and exhaust pipes under the same
atmospheric conditions (T ype 4) the maxim um length is 43
metres (80) and 28 metres (100), f
or runs with the ter minals
under different atmospheric conditions (Type 5) the e xhaust ter-
minal must extend 0.5 metres above the ridge of the roof (this is
not obligatory if the e xhaust and air intak e pipes are located on
the same side of the building). For Type 5 also, the maximum per-
missible combined length is 40 metres (80) and 51 metres (100).
The maximum length is reached by combining the total lengths of
both the air intak e and e xhaust pipes. Therefore a maxim um
length of 40 metres for example, will allow a flue run of 20 metres
for the air intak e and 20 metres f or the exhaust pipes, also for
o
each 90
elbow 1.3 metres m ust be subtr acted from the total
length and for each 45
elbow 1 metre m ust be subtracted from
o
the total flue length.
Some of the acceptable flue configurations are detailed on below
(F
. 6.19).
IG
F
6.17
IG
For further information relating to flue runs not illustrated, please
contact the Technical Department on 0870 2418180.
F
6.18
IG
F
6.16
IG
16
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