RAYBURN
COOKERS
INSTALLATION
THIS SECTION
OTHER SECTIONS
BALANCED FLUES (OIL-FIRED)
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 Balanced Flue Terminal |
A balanced flue can be useful for installing an oil-fired Rayburn in a situation where no conventional chimney exists.
Balanced flues are only suitable for Kerosene (oil) Rayburn's, not gas oil (diesel)
There are however a number of important points to be considered as to where the flue can be situated, so as to comply with current legislation and good practice.
Places to be avoided are ;-
Underneath windows // close to doorways // adjacent to obstructions or protruding buildings // discharging into car-ports and garages, alleyways or public thoroughfares // too close to a facing obstruction such as a fence.
The flue can only exit straight from the rear of the Rayburn to outside: bends are not permitted. Standard flue length 250mm - 430mm
Optional extension up to 880mm
No additional extensions are allowed, beyond these lengths.
See also . 400 series dimensions
The following illustration shows the minimum clearances required.
| A | BELOW A GUTTER OR SANITARY PIPEWORK | 600mm | H | VERTICAL FROM TERMINALS ON THE SAME WALL | 1500mm |
| B | HORIZONTAL FROM OPENING, AIR BRICK, WINDOW ETC | 600mm | I | HORIZONTAL FROM TERMINALS ON THE SAME WALL | 600mm |
| C | ABOVE GROUND OR BALCONY LEVEL | 600mm | J | BELOW AN OPENING, AIR BRICK, WINDOW ETC | 600mm |
| D | BELOW EAVES OR BALCONY | 600mm | K | FROM VERTICAL SANITARY PIPEWORK | 600mm |
| E | FROM AN INTERNAL OR EXTERNAL CORNER | 600mm | L | FROM AN OIL STORAGE TANK |
1800mm |
| F | FROM A TERMINAL FACING A TERMINAL | 600mm | |||
| G | FROM A SURFACE FACING A TERMINAL | 600mm |
These are minimum dimensions to ensure that the products of combustion can clear satisfactorily, but they cannot take into account any special adverse site conditions, such as extra turbulent wind in exposed regions. e.g. adjacent to cliffs or high hills.
If the flue terminates within 1 metre of plastic material such as guttering or waste pipes, they must be shielded for protection.
If the flue terminates within 2 metres of ground level or in a position where it can be touched, then a protective wire cage must be fitted. (supplied with the Rayburn) see example in photograph above.
If the flue passes through a wall consisting of combustible material e.g. in a timber framed building, additional precautions must be taken. Where the terminal passes through the wall it must be surrounded by non-combustible material 50mm thick. This in turn must be sleeved to prevent moisture reaching the insulation material.
If the flue terminates on a wall which is clad with combustible material, this must be cut back 50mm beyond the outer edge of the terminal and replaced by a non-combustible material.
One final important point. Appliances with pressure jet burners do generate certain natural combustion noises. These are transmitted through to the flue terminal and can thus be heard outside the building. Care must therefore be taken to ensure that the flue terminal position will not give rise to complaints from neighbours or constitute a nuisance to adjacent amenities such as a patio..
How a balanced flue works.
Air for combustion 'A' enters from outside via its own tube supplying the burner 'B' . Products of combustion 'C' leave via their own discharge tube. Both the inlet and outlet tubes are subjected to the same wind or air pressure conditions 'D' hence the name balanced flue.
The flue terminal is typically protected by a wire cage 'J'
No air for combustion is taken from the room as the appliance flue-ways etc are room sealed 'E', an alternative name for this type of appliance.
The ovens 'F' are vented by a small electric fan 'G' with its own discharge pipe to outside, replacement air entering the ovens at 'H'