INSTALLATION | 21
6 720 ... ... (YYYY/MM)Product Name
Gas connections
Flue opening
5.4 Flue options
Fig. 18 Flue options
DANGER: Risk to life from explosion of flammable gases
▶ Work on components in contact with gas must only
be carried out by a competent and authorised
person.
▶ Comply with national and local standards and
regulations
▶ Only use approved methods of making gas tight
connections
Surplus water may be present due to factory testing.
Any horizontal flue sections must rise away from the
boiler by 52mm per metre to ensure that condensate
flows back into the boiler for safe discharge via the
condensate waste pipe.
CAUTION: Non accessible flue systems:
▶ Where a flue system is not going to be accessible,
provision must be made for service and inspection.
▶ Voids containing concealed flues must have at least
one inspection hatch no less than 300mm square.
▶ Flue joints within the void must not be more than 1.5
metres from the edge of the inspection hatch.
▶ Inspection hatches should be located at changes of
direction.
▶ If this is not possible, bends should be viewable from
both directions.
NOTICE: Effective flue lengths:
▶ each 90 ° bend used is equivalent to 2.0 metres of
straight flue
▶ each 45 ° bend used is equivalent to 1.0 metre of
straight flue
Maximum total
flue length L (mm)
Flue type
1 High level horizontal flue 11 000
2 High level horizontal flue with 2 x 90 ° bends 9 000
3 High level horizontal flue with 3 x 90 ° bends 7 000
4 Vertical balanced flue assembly 15 000
5 Vertical balanced flue with 2 x 90 ° bends 11 000
6 Vertical balanced flue with 2 x 45 ° bends 13 000
Table 10 Flue options
3
L
120 mm
120 mm
1
L
120 mm
2
L
6720809859-82.1Wo
Flat roof
300 mm
500 mm
Pitched
roof
4
L
5
L
6
L
120 mm
120 mm
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