Technical data

34
4.2.3 Standard Supply (concentric horizontal)
Theapplianceissuppliedwithastandardconcentricairandueduct
systemsuitableforuelengthsofupto725mm(28.5in)measuredfrom
the centre of the fan outlet of the boiler to the outside surface of the wall
(or window). The duct assembly is connected to the boiler via a turret
elbow, which can be positioned to exit the boiler in any horizontal direc-
tion (see Fig. 15).
Foruelengthslessthan650mm(25.5in)theoutletterminalductmust
be shortened. Shorten the duct by cutting approximately equal lengths
from both halves as required.
4.2.4 Additional Kits
The following additional concentric kits are available as optional extras
andtheseuekitsmaybeusedwiththestandarduekittogiveanex-
tensiverangeofueoptions.ExamplesareillustratedinFig.14.
a) Extension Duct:
Withtheuseofconcentricueextensionducts(seeFig.14),thetotal
uelengthofthesystemmeasuredfromthecentreofthefanoutletof
the boiler to the outside surface of the wall (or window) can be increased
up to 3000 mm (118 in) (See Fig. 14). Each 1000 mm extension duct
extendstheuelengthby973mm.andeach500mmextensionduct
extendstheuelengthby473mm.
b) 90o Elbow:
Additional90°elbowscanbe addedto theue systemtoallowaddi-
tionalbendsintheuesystemtogivegreaterexibilityinthelocation
of the boiler.
The resistance of the bends must be taken into account when determin-
ing the permissible maximum length of the ue system.A 90o elbow
has an “equivalent length” of 973 mm, one 1000 mm extension duct. No
more than two elbows should be used.
c) Elevation Duct:
Thisistobeusedforelevatedhorizontaluesifrequired.Withstandard
elevation duct, 300 mm elevation is possible from the top of the boiler
before turning to the horizontal direction with elbow.
NOTE: Variations may be used providing that the following rules are
strictly adhered to: