INSTALLATION & SERVICING MANUAL BENSON PV TUBULAR CABINET HEATER

The following distances in mm’s should
be observed
200 below guttering or eaves
the 25mm separation distance should be
measured from the outside surface of the
inner liner.
300 from corners or openings (windows
doors etc) and from other horizontal
terminals on same wall
1200 from a facing surface
1500 from another terminal vertically on the
same wall
2000 from ground level
The materials from which the flue is
constructed must be non-combustible,
resistant to internal and external corrosion,
and be capable of withstanding the stresses
and loadings associated with normal use.
When designing the flue system the
prevention of the formation and entrapment
of condensation must be a key
consideration.
Horizontal flue should be fitted ensuring a
slight gradient approx 2 0 towards the
terminal Where condensation is unavoidable
traps should be included to encourage the
condensates to flow freely to a point from
which they may be released, preferably into
a gully.
The condensate pipe from the flue to the
disposal point must be made from corrosion
resistant pipe of not less than 25mm internal
diameter.
If the flue passes through a wall, ceiling, or
roof made from combustible material then it
has to be sleeved so as to provide a
minimum of a 25mm void between the
exterior of the flue and the internal wall of
the sleeve.
For double wall flue pipe conforming to
BS 4543-2 and 3 the external skin and air
gap constitutes insulation to a standard
where no extra clearance from combustible
material is required other than normal
installation tolerances
Double walled pipe conforming to BS 715
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