Condensate Plume disPersal
When choosing the location for a condensing boiler, special consideration must be given to the positioning of the flue
terminal. Care should be taken to locate it so as to prevent either the end user or their neighbours perceiving the plume to be
a nuisance.
It should be noted that the normal statutory clearances required around low level flue terminals may not be sufficient to cope
with plume dispersal from a condensing boiler. The following points should be considered:
1. Plumes can extend out horizontally and can also drift out to the sides and above the terminal. Care needs to be taken,
therefore, to avoid the plume reaching adjacent surfaces, particularly windows and neighbours dwellings.
2. Flue terminals need to be located where air can pass freely across them to disperse vapours.
3. The effect of the moisture generated must be considered in relation to the possible corrosion of metal parts it might reach
and to the possible formation of ice on pathways in freezing conditions.
4. Keep flue terminals a minimum of 1m (horizontally) from openings in the building.
5. Do not install flue terminals directly below a window.
6. Do not install flue terminals next to a door.
7. Do not install flue terminals within 1m of ventilated soffits or eaves.
8. Keep flue terminals at least 2.5m away from a surface or boundary facing the terminal.
9.
In certain circumstances the installation of a plume dispersal extension to the flue may be unavoidable. This takes the
plume exhaust from the boiler up and away from any obstruction, door or window opening and will also prevent the risk
of re circulation of the plume gasses into the air intake of the burner.
Please note that only Firebird flue kits should be used for flue installations.
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2.2 stanDaRDs & Regulations - Flue Regulations
