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page 20
7.7 Flue
NOTE: Due to the high efficiency of the boiler a plume of
water vapour will be discharged from the flue. This should be
taken into account when siting the flue terminal.
1. The following guidelines indicate the general requirements for siting balanced flue terminals.
For GB recommendations are given in BS 5440 Pt.1.
For IE recommendations are given in the current edition of I.S. 813 "Domestic Gas Installations".
2. If the terminal discharges onto a pathway or passageway, check that combustion products will not cause a nuisance and that the
terminal will not obstruct the passageway.
3. Take into consideration the effect the plume of vapour may have on neighbours when siting the flue.
4. Adjacent surfaces close to the flue terminal may need protection from the effects of condensation. Alternatively a flue deflector
kit (part no. 248167) is available.
5. For installation of the flue into an internal corner at the 25mm dimension the flue deflector kit (part no. 248167) must be fitted.
6. * Reduction to the boundary is possible down to 25mm but the Flue Deflector Kit (part no. 248167) must be fitted.
7. If required a suitable terminal guard is available from Baxi for use with the flue deflector.
8. For fitting under low soffits and eaves the Plume Displacement Kit or Flue Deflector Kit is recommended.
9. If a terminal is less than 2 metres (78
a suitable terminal guard must be provided.
IMPORTANT:
Under car ports we recommend the use of the plume
displacement kit.
The terminal position must ensure the safe and nuisance
free dispersal of combustion products.
Terminal Position with Minimum Distance (Fig. 17)
1
Directly below an opening, air brick, opening windows, etc.
A
1
Above an opening, air brick, opening window etc.
B
1
Horizontally to an opening, air brick, opening window etc.
C
D
Below gutters, soil pipes or drain pipes.
2
E
Below eaves.
2
F
Below balconies or car port roof.
2
G
From a vertical drain pipe or soil pipe.
2
3/
in) above a balcony, above ground or above a flat roof to which people have access, then
4
(mm)
300
300
300
25 (75)
25 (200)
25 (200)
25 (150)
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