FLUE TERMINAL POSITIONS
Minimum dimensions of flue terminal positions for balanced room sealed flues with fanned draught:
| DRWG. | TERMINAL POSITION | DISTANCE | |
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| A1 | Directly below an opening, air brick, opening windows, etc. | 300mm |
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| B1 | Above an opening, air brick, opening window, etc. | 300 mm | |
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| C1 | Horizontally to an opening, air brick, opening window, etc. | 300 mm |
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| D | Below gutters, soil pipes or drain pipes | 75mm |
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| E | Below eaves | 200mm | |
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| F2 | Below balconies or car port roof (lowest point) | 200mm | |
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| G | From a vertical drain pipe or soil pipe | 150mm | |
| H | From internal or external corner or to a boundary alongside the terminal | 300mm** |
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| I | Above ground, roof or balcony | 300mm | |
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| J | From a surface or boundary facing the terminal | 600mm** | |
| K | From a terminal facing the terminal | 1200mm | |
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| L2 | From an opening in the car port (e.g. door, window) into the dwelling | 1200mm | |
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| M | Vertically from a terminal on the same wall | 1500mm | |
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| N | Horizontally from a terminal on the same wall | 300mm | |
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| O | From a non combustible vertical structure on the roof |
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| P | Above intersection with the roof | * |
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•The flue must be fitted and terminated in accordance with the recommendations of BS5440 : Part 1.
•The flue must not cause an obstruction.
•Discharge and any noise from the flue outlet must not cause a nuisance.
•Flue gases have a tendency to plume and in certain weather conditions a white plume of condensation will be discharged from the flue outlet. This could be a nuisance, for example, near security lighting.
•The air inlet/outlet duct and the terminal of the boiler must not be closer than 25mm to any combustible material.
Detailed recommendations on protection of combustible materials are given in
BS 5440:1.
•A protective terminal guard must be fitted if the terminal is 2m or less above a surface to which people have access.
The guard must be spaced equally (minimum 50mm) around the flue and fixed to the wall with plated screws.
See Contact Information (inside front cover).
PRE - INSTALLATION
1In addition, the terminal should not be nearer than 150mm (fanned draught) to an opening in the building fabric formed for the purpose of accommodating
a built-in element such as a window frame.
2 Not recommended.
*
**Care should be taken to ensure terminal siting does not cause a nuisance to adjacent properties.
The flue should not penetrate the shaded area.
600mm
600mm
2000mm
16
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior 8 716 107 336b (11/05)
