Operating instructions

16
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 m
ust 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
each 90
o
elbow 1.3 metres m ust be subtr acted from the total
length and for each 45
o
elbow 1 metre m ust be subtracted from
the total flue length.
Some of the acceptable flue configurations are detailed on below
(F
IG. 6.19).
For further information relating to flue runs not illustrated, please
contact the Technical Department on 0870 2418180.
FIG 6.17
FIG 6.16
FIG 6.18
Installation