2
8
2.2 stanDaRDs & Regulations - Flue Regulations
BalanCeD Flue BoileRs
The Firebird boiler may be set for room-sealed flue operation using a Firebird condensing balanced flue kit. This kit does not
draw combustion air from inside the room. it is drawn from outside, direct to the burner by an air pipe supplied with the
boiler. Flue gases are expelled through the same kit. However, if the boiler is installed in a compartment or small room, some
ventilation air is necessary to maintain an acceptable temperature in the boiler area.
550mm
2
/kW
550mm
2
/kW
1100mm
2
/kW
1100mm
2
/kW
of boiler output
Balanced flue boiler in room does not require individual ventilation.
BalanCeD - Flue BoileRs in CoMPaRtMents
notes: these notes form an integral part of the information shown on the previous page.
1. Terminals should be positioned to avoid products of combustion accumulating in stagnant pockets around the
building, or entering into buildings.
2. Appliances burning Class D oil have additional restrictions (see OFTEC Book Four).
3. Vertical structures in N, O and P include lift rooms, parapets, dormers etc.
4. Terminating positions A to L are only permitted for appliances that have been approved for low level flue and low
level balanced flue discharge when tested to BS EN 303-1.
5. Terminating positions must be at least 1.8m distant from a fuel storage tank unless a wall with at least 30 minutes
fire resistance and extending 300mm higher and wider than the fuel storage tank is provided between the fuel
storage tank and the terminating position.
6. Where a flue is terminated less than 1m away from a projection above it and
the projection consists of plastic or has a combustible or painted surface,
then a heat shield of at least 750mm wide should be fitted to protect these
surfaces.
7. If the lowest part of the terminal is less than 2m above the ground, balcony,
flat roof or other place to which any person has access, the terminal must
be protected by a guard.
8. Notwithstanding the dimensions given in the diagram and table, a
terminal should not be sited closer then 300mm to combustible material.
9. It is essential that a flue or chimney does not pass through the roof
within the shaded area shown by dimensions Q and R.
10. Where protection is provided for plastic components, such as guttering, it
is essential that this is to the standard specified by the manufacturer of the
plastic components.
Separation Between a Boundary
and Terminal at Right Angles
Boundary as
Party wall
Pressure
Jet
Appliance
Plan at party wall
300mm
minimum
Diagram 20b
