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
P
g
See note 3
T
b
d
d
ee
See note 2
h
h
a
g
h
j
j
j
nk
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 terminal 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.
