Technical data

Appliance
Input (kW)
0-7
7-14
14-32
over 32
0-7
7-14
14-32
over 32
0-7
7-14
14-32
over 32
Air Terminal
Position
Above a
Terminal
Below a
Terminal
Horizontally
to a Terminal
7.0 Site Requirements
14
7.8 Flue & Air Terminals
1. The flue terminal position must always be
in accordance with the current edition of B.S.
5440 Part 1, and either Part J of the Building
Regulations England and Wales or Part F of
the Building Standards (Scotland)
Regulations as appropriate.
2. The positioning of the air terminal (separate
terminal systems only) is not as critical as that of
the flue terminal except with respect to other flue
terminals, including that of the appliance the air
terminal is serving.
3. When positioning the air terminal general
reference should be made to BS 5440 Pt. 2.
Specifically the air terminal must be separated
from any other flue terminal by at least the
dimensions given in Table 1.
4. The air terminal must draw directly from
outside. It is not permissible to locate it in a loft
space, compartment or similar even when there is
adequate ventilation.
5. See Section 7.5 “Location” for details of which
walls the terminals may be located on. Minimum
clearances from the flue terminal are given in Fig.
11 and the accompanying table.
6. If the flue terminal discharges onto a pathway
or passageway, check that combustion products
will not cause a nuisance. Ensure that any
terminal will not obstruct any pathway or
passageway.
7. If a terminal is less than 2 metres above a
balcony, above ground or above a flat roof to
which people have access, then a suitable
terminal guard must be provided. This also
applies to the air terminal where provision of the
guard will prevent damage or blockage, rather
than the protection of persons from hot flue
gases.
8. The terminals must be positioned such that
they will not become obstructed by leaves, snow
or similar and not be subject to rain entry.
Fig. 11
L
G
G
E
J
D
K
G
A
A
D
F
H,I
B,C
F
Likely flue positions requiring
a flue terminal guard
M
N
Natural
Draught
300
600
1500
2000
300
300
300
600
300
400
600
600
Fanned
Draught
300
300
300
300
300
300
300
300
300
300
300
300
Separation in mm from
another terminal
Table 1
Note: “Appliance Input” refers to any other appliance
as well as the one served by the air terminal
300 min
Terminal
Assembly
Top View Rear Flue
Property Boundary Line
Terminal Position with Minimum Distance (Fig. 11) (mm)
A Directly below an openable window, air vent or any other
ventilation opening. 300
B Below gutter, drain/soil pipe. 25
C Below eaves. 25
D Below a balcony/car port roof. 25
E From vertical drain pipes and soil pipes. 25
F From internal or external corners. 25
G Above adjacent ground or balcony level. 300
H From a surface facing a terminal. 600
I Facing a terminals. 1200
J From opening (door/window) in carport into dwelling. 1200
K Vertically from a terminal on the same wall. 1500
L Horizontally from a terminal on the same wall. 300
M Above an opening, air brick, opening window etc. 300
N Horizontally to an opening, air brick, opening window etc. 300