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Clearance of flue terminals
T = Flue Terminal
M = Gas Meter
Shaded area indicates
prohibited area
I = Mechanical air inlet
P = Electrical meter or fuse box
W = Window
Ref
Item
Minimum
Clearance
mm
Natural
draft
Fan
assisted
a
Below eaves, balconies and other projections
Appliances up to 50MJ/h input
300
200
Appliances over 50 MJ/h input
500
300
b
From the ground, above a balcony or other surface
300
300
c
From a return wall or external corner
500
300
d
From a gas meter
1000
1000
e
From an electricity meter or fuse box (P)
500
500
f
From a drain pipe or soil pipe
150
75
g
Horizontally from any building structure or obstruction facing a flue
terminal
500
500
h
From any other flue terminal, cowl, or combustion air intake
500
300
j
Horizontally from an opening window, door, non-mechanical air inlet. Or other opening
into a building with the exception of sub floor ventilation
Appliances up to 150 MJ/h
500
300
Appliances over 150MJ/h input up to 200 MJ/h input
1500
500
Appliances over 200 MJ/h input
1500
1500
All fan assisted flue appliances in the direction of discharge
1500
k
From a mechanical air inlet, including spa blower
1500
1000
n
Vertically below an openable window, non-mechanical air inlet, or any other opening into a
building with the exception of sub-floor ventilation:
Space heaters up to 50 MJ/h
150
150
Other appliances up to 50 MJ/h
500
500
Appliances over 50 MJ/h and up to 150 MJ/h input
1000
1000
Appliances over 150 MJ/h input
1500
1500
Extract from AG601 For use as a guide only. Refer to AS5601/AG601 for
clearance
25/10/2011
