H120 –H150 Hot Water Boilers
page 6
3.2 GUIDE TO INSTALLATION
Location of Flue Terminals – An extract from AG 601
Minimum Clearances Required For Balanced Flue Terminals or The Terminals Of Outdoor
Appliances.
openable
window
door
M
P
g
See note 3
T
b
d
d
e
e
See note 2
h
h
a
g
h
j
j
j
n
k
k
c
c
f
T = Flue terminal
I
= Mechanical air inlet
M = Gas meter
P = Electricity meter
or fuse box
Shading indicates prohibited
areas for flue terminals
T
T
I
MIN. CLEARANCE
(mm)
A
Below eaves, balconies and other projections
Appliances up to 50 MJ/h input
300
Appliances over 50 MJ/h input
500
B
From the ground,
above a balcony
or
other surface
300
C
From a return wall or external corner
500
D
From a gas meter (M)
1000
E
From an electricity meter or fuse box (P)
500
F
From a drain pipe or soil pipe
150
G
Horizontally from any building structure (unless appliance approved
500
for closer installation) or obstruction facing a terminal
H
From any other flue terminal, cowl, or combustion air intake
500
I
Horizontally from an openable window, door, non-mechanical air inlet, or any
other opening into a building with the exception of sub-floor ventilation
500
Appliances up to 150 MJ/h input
500
Appliances over 150 MJ/h input (natural draught)
1500
Appliances over 200 MJ/h input
1500
All fan-assisted flue appliances, in direction of discharge
1500
K
From a mechanical air inlet, including a spa blower
1500
N
Vertically below an openable window, non-mechanical air inlet, or any other
opening into a building with the exception of sub-floor ventilation
See table
CLEARANCE ‘n’ (mm)
Space heaters
All other appliances
Up to 50 MJ/h
input
Up to 50 MJ/h
input
Over 50 MJ/h &
up 150 MJ/h
Over 150 MJ/h
input
150
500
1000
1500
NOTES:
1
All distances are measured
to the nearest part of the
terminal.
2
Prohibited area below electricity meter or fuse box extends to ground level.
3
See Clause 5.13.6.6 for restrictions on a flue terminal under a
covered
area.
4
See
Appendix
J, Figures J1(a) and J2(a), for clearances required from a flue
t
erminal to an LP Gas cylinder.
A flue terminal is considered to be a source of ignition.
The above information is part of AG 601 FIGURE 5.3 as supplied by the AGA and is provided as an indication of the
correct clearances only. Please refer to the latest issue of AG 601.
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