From - Viessmann Vitodens 100-W Compact Domestic Product Manual

Flue termination position
Position
A Directly below an openable window, air vent or any other ventilation opening
B Below a gutter, drain or soil pipe
C Below eaves
D Below a balcony
E From vertical drain or soil pipes
F From internal and external corners
G Above adjacent ground or balcony level/roof
From a surface facing the terminal
H
I Facing terminals
J From opening door/window in carport into dwelling
K Vertically from a terminal on same wall
L Horizontally from a terminal on same wall
Adjacent to opening
M
N Below carport/roof
O From adjacent wall
From adjacent opening window
P
Q From another terminal
R Min. height
S Min. distance measured perpendicular to roof covering
Flue terminal location for standard boilers
A
G
D,N
F
J
H,I
Additional requirements for condensing boilers
Minimum distance from terminal
2.5m
Boundary
C
B,C
B,C
L
K
K
M
K
K
E
F
A
F
G
G
Not under a car port
7
for standard boilers
L P
R
Avoid access routes and patios
4
2.1m
Walkway
or patio
Minimum spacing
for condensing boilers
300 mm
75 mm
200 mm
200 mm
150 mm
300 mm
300 mm
600 mm
1 200 mm
1 200 mm
1 500 mm
300 mm
300 mm
300 mm
300 mm
1 000 mm
600 mm
300 mm
400 mm
Q
S
O
O
Detailed recommendations for flue installation are given in BS 5440:1.
Minimum distance to car
parking space
7
Car
space
20/21
Minimum spacing
2 500 mm
2 500 mm
not recommended
not recommended
4
2.5m