12
GENERAL REQUIREMENTS
Flue termination
The following details refer to both
flue systems.
a. The terminal must be positioned
such that the products of
combustion can disperse freely at
all times.
b. In certain weather conditions a
plume of water vapour may be
visible from the flue terminal.
Positions where this could be a
nuisance should be avoided.
c. If the terminal is fitted less than
2 m above a balcony, above
ground or above a flat roof to
which people have access then a
suitable terminal guard;
280 mm x 280 mm deep, must be
provided and fitted (made by
Tower Flue Components,
Tonbridge, TN9 1TB).
Note: Vertical flues must not
terminate within 600 mm of an
openable window, air vent or any
other ventilation opening.
Where a terminal is fitted less than
1 m below a plastic gutter or less
than 0.5 m below painted eaves or
any other painted surface then a sui-
table shield at least 1 m long should
be fitted to protect the surface.
Fig. R.6: Flue termination
Terminal position for fan-assisted flue (minimum distance) mm
A1) 300
BBelow gutters, soil pipes or drain pipes 25
CBelow eaves 25
DBelow balconies (below car port roof) 25
EFrom vertical drain pipes and soil pipes 25
FFrom internal or external corners 25
GAbove ground or balcony level 300
IFrom a terminal facing a terminal 1200
KVertically from a terminal on the same wall 1500
LHorizontally from a terminal on the same wall 300
MDistance from adjacent wall for vertical Flue 500
GW 595/2
JFrom an opening in a car port (e.g. door, window)
into a dweling 1200
HFrom a surface or boundary facing a terminal 600*
Directly below an openable, above an opening or
horizontal to an opening i.e. air brick, opening
window or other , etc
Table R.1. Terminal position for a fan assisted concentric flue (see fig. R.6)
1) In addition, the terminal should not be nearer
than 150 mm to an opening in the building fabric
formed for the purpose of accommodating a built-in
element such as a window.
* BS 5440-1 It is recommended that a fanned flue
terminal should be positioned as follows: a) at least
2m from an opening in a building directly opposite,
and b) so that the products of combustion are not
directly directed to discharge across a boundary.
