Keston Thermomatic RSM20/FB, Installation & Servicing Instructions Manual, Page: 10 / 46

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3.4.5 The flue system must be installed in accordance
with BSS440 Part 1.
3.4.6 Siting of flue terminal
It is essential that products of combustion cannot enter
any building through such as openable windows, doors,
air bricks, etc.
Fig 3.7 gives details of the minimum required spacing of
the 'terminal from building features.
3.4.7 Terminal guard
Where the terminal is fitted within 2m of a walkway. a
balcony or a fiat roof to which people have access, then
a terminal guard, model C.1 must be fitted centrally over
the terminal. This guard is available from KESTON
BOILERS.
3.4.8 Air supply
This appliance is room sealed and. when installed in a
room or space, requires no ventilation. If installed in a
cupboard/compartment, air is required for cooling
purposes, as follows:
Position of Air
Vents Air from Room
or Internal
Space Air Direct from
Outside
High level 236 cm²
36-6 ins² 1 1 8 cm²
18.3 ins²
Low level
36.6 ins² 236 cm²
18.3 ins² 1 1 8 cm²
Both air vents must communicate with the same
room or space, or both must be on the same wall to
outside air.
3.5 APPLIANCE LOCATION
3.5.1 This appliance is not suitable for external
installation.
3.5.2 The wall on which the appliance is mounted
must be of suitable load bearing capacity
3.5.3 Installation in a compartment is permitted (full
guidance is provided in BS.6798).
3.5.4 Adequate space must be allowed for installa-
tion, subsequent servicing, and safe operation.
Appliance dimensions and the minimum allowable
clearances required are shown in Figs. 3. t and 3.8
TERMINAL POSITION
Minimum distance
Fanned draught.
A. Directly below an openable window or other
opening. e.g. an air brick 300 mm
B. Below gutters, soil pipes or drain pipes 75 mm
C. Below eaves 200 mm
D. Below balcony 200 mm
E. From vertical drain pipes and soil pipes 75 mm
F. From internal or external corners 300 mm
TERMINAL POSITION
Minimum distance
Fanned draught.
G. Above ground or balcony level 300 mm
H. From a surface facing a terminal 600 mm
I. From a terminal facing a terminal 1200 mm
J. Vertically from a terminal on the
same wall
1500 mm
K. Horizontally from a terminal on the
same wall 300 mm
Fig. 3.7 SITING OFTHE TERMINAL