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BalanCeD Flue siting
The terminal should be positioned to avoid combustion products entering the building or accumulating in
stagnant pockets around buildings. The terminal must be protected by a guard if it is less than 2 metres above
ground level or in a position where any person has access to it (i.e. a balcony). A heat protection shield should be
fitted if the terminal is less than 850mm from a plastic or painted gutter or less than 450mm from painted eaves.
Prevailing winds should be taken into account when siting a flue.
alWays CHeCK FoR any BuilDing Regulations aMenDMents WHiCH May
Have Been issueD aFteR tHe PuBliCation oF tHis Manual
2
7
2.2 - stanDaRDs & Regulations - Flue Regulations
Clearances advised by Bs 5410 Part 1: 2014
Regular appliance (open, low level Discharge and Balanced) Flue termination Clearance
The basic requirement with regard to flue positioning is that no hazard or nuisance is caused by the flue gases.
Diagrams 20a and 20b show clearances advised by BS 5410 Part 1: 2014.
Regional requirements where flue clearances differ can be found in the
regional requirements section in OFTEC Book 3 2010.
A
G
E
B
C & D
K
F
F
L
N
O
P
H
J
Boundary
Boundary
F
Q
Q
Q
Q
Q
Q
Q
R
Pressure Jet
Location
Appliance Burner Type
Condensing
UK
ROI & NI
A Directly below an opening, airbrick, opening window etc.
1000mm
600mm
B Horizontally to an opening, airbrick, opening window etc.
1000mm
600mm
C Below a gutter, eaves or balcony with protection
1000mm
1000mm
D Below a gutter or a balcony without protection
1000mm
1000mm
E From vertical sanitary pipe work
300mm
300mm
F From an internal or external corner or surface or boundary alongside the terminal
300mm
600mm
G Above ground or balcony level
300mm
300mm
H From a surface or a boundary facing the terminal
1200mm
1200mm
J
From a terminal facing the terminal
2500mm
2500mm
K Vertically from a terminal on the same wall
1500mm
1500mm
L Horizontally from a terminal on the same wall
750mm
750mm
M Above the highest point of an intersection with the roof
600mm
600mm
N From a vertical structure on the side of the terminal
750mm
750mm
O Above a vertical structure less than 750mm from the side of the terminal
600mm
600mm
P From a ridge terminal to a vertical structure on the roof
1500mm
1500mm
Q Above or to the side of any opening on a flat or sloping roof
300mm
300mm
R Below any opening on a sloping roof
1000mm
1000mm
M
Minimum distances to terminals in millimeters as measured from the top of the chimney
or the outer edge of where flue gases pass through low level discharge openings
Diagram 20a