Help Centre| Terminal Position | Min distance (mm) | |
| A | Directly below an opening, air brick, windows, etc. | 300 (See Note 1) |
| B | Below gutters, soil pipes or drain pipes | 75 (See Note 3) |
| C | Below eaves | 200 (See Note 3) |
| D | Below balconies |
200 (See Note 3) |
| E | From a vertical drain pipe or soil pipe | 150 (See Note 3) |
| F | From an internal or external corner | 300 (See Note 2) |
| G | Above ground, roof or balcony level | 300 |
| H | From a surface or boundary facing the terminal | 600 (See Note 4) |
| I | From a terminal facing the terminal | 1200 |
| J | Above an opening, air brick, window etc. | 300 (See Note 1) |
| K | Vertically from a terminal on the same wall | 1500 |
| L | Horizontally from a terminal on the same wall | 300 |
| M | Horizontally from an opening, air brick, window etc. | 300 (See Note 1) |
| N | Minimum protrusion through a roof | 300 |
| O | From a vertical obstruction | 300 |
| P | From an openable window | 600 |
| Q | From an adjacent vertical terminal | 300 |
| R | From an opening in the car port (e.g. door, window) into the dwelling | 1200 |
| S | Below a roof window | 2000 |
| T | Terminal parallel to a boundary | 300 |
Notes:
1. In addition, the terminal should not be nearer than 150mm to the framework of an opening into the building, i.e. a window surround or door surround.
2. This clearance may be reduced to 25mm without effecting the performance of the boiler. However, to ensure the condensate plume does not affect adjacent surfaces a clearance of 300mm is preferable.
3. These clearances may be reduced to 25mm without affecting the performance of the boiler. However, to ensure the condensate plume does not affect adjacent surfaces the terminal can be extended beyond gutters, pipes, eaves, balconies etc. by up to 500 mm. If the flue is extended more than 500mm outside, it should be boxed and insulated.
4. To reduce the possibility of nuisance to neighbouring buildings etc. it is recommended the terminal should not be less than 2500mm from car parking spaces, building boundary walls, fences etc.
5. A terminal must not be sited under a car port roof.
6. In certain weather conditions the terminal will emit a plume of steam. If possible avoid positioning the terminal where this may cause a nuisance, i.e. positions A, D, G, H, J or M.
7. The flue terminal must be exposed to the external air and the position must allow the free passage of air across it at all times.
8. A terminal must not be sited below 2m where people have access to, such as public footpaths, access routes, patios etc. However, if the terminal is fitted less than 2m above a surface where there is no public access, the terminal must be protected by a terminal guard.