Flue System 47
The minimum distances between the flue exhaust terminal and the building elements must comply with those shown in the following table:
Flue outlet positions
A
J
J
J
N
O
O
T
T
T
O P
G D
N
N
N
Q
C B
J
M
F
F
A
R
G
G
H
B
G
G
S
S
P
P
E M
I
L
L
K
K
Window
N
Terminal Position
Min. distance (mm)
A Directly below an opening, air brick, windows, etc.
300*
B Below gutters, soil pipes or drain pipes
75***
C Below eaves
200***
D Below balconies
200***
E From a vertical drain pipe or soil pipe
150***
F From an internal or external corner
300**
G Above ground, roof or balcony level
300
H From a surface or boundary facing the terminal
600****
I
From a terminal facing the terminal
1200
J
Above an opening, air brick, window etc.
300*
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*
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
600
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
* In addition, the terminal should not be nearer than 150 mm to the framework of an opening into the building, i.e. a window surround or door surround.
** This clearance may be reduced to 25 mm without effecting the performance of the boiler. However, to ensure the condensate plume does not affect
adjacent surfaces a clearance of 300 mm is preferable.
*** These clearances may be reduced to 25 mm without effecting 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 500 mm
outside, it should be boxed and insulated.
**** To reduce the possibility of nuisance to neighbouring buildings etc. it is recommended the terminal should not be less than 2500 mm from car parking
spaces, building boundary walls, fences etc.
