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Internal corner
External corner
Double corner
Minimum Separation Distances for Flue Terminals
Location
(see diagram)
A
Below an opening (See Note 1)
B
Above an opening
C
Horizontally to an opening
D
Below gutters, soil pipes or drain pipes
E
Below eaves
F
Below balcony or car port roof
G
From a vertical drain pipe or soil pipe
H
From an internal or external corner or to a boundary alongside the termi-
nal (See Note 2)
I
Above ground, roof or balcony level
J
From a surface or a boundary facing the terminal (See Note 2)
K
From a terminal facing the terminal
L
From an opening in the car port into the building
M
Vertically from a terminal on the same wall
N
Horizontally from a terminal on the same wall
P
From a structure on the roof or another roof terminal
Q
From a vertical fl ue terminal to an adjacent wall
R
From a vertical fl ue terminal to an adjacent wall which includes an open-
ing window (See Note 3)
Notes:
1. An opening here means an opening element, such as an openable window, or
a fi xed opening such as a air vent. However, in addition, the outlet should not
be nearer than 150mm to an opening into the building fabric formed for the
purpose of accommodating a built in element, such as a window frame.
2. Boundary as defi ned in the Building Regulations (England & Wales) or the
Building Standards (Scotland) Regulations.
3. Where the wall adjacent to a vertical fl ue terminal includes an opening win-
dow, the clearance between the terminal and any part of the opening window
must not be less than 1000 mm.
Boundary
R
H
J
Boundary
Description
P
Q
Q
B
F
C
A
L
G
I
Figure 3
D,E
Q
N
H
M
H
K
Clearance
(mm)
300
300
300
75
200
200
150
300
300
600
1200
1200
1500
300
600
300
1000
12
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