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Roof duct with 45-degree bends (see illustration 11, page 24).
Always place a length of X=1 metre vertically on the appliance. The route can then be continued with
two 45-degree bends until the maximum length of 12 metres is reached (Y+Z= 8 metres maximum).
The nominal length of the 45-degree bend is 1 meter. Until 6 metres baffle - L - should be used (see
page 13 ill.1 L). From 6 metres till 12 metres baffle - M - and - L - should be used (see page 13 ill. 1 M -
L)
Roof duct with 90-degree bends (see illustration 12, page 24).
Always place a length of X=1 metre vertically on the appliance. The route can then be continued with
two 90-degree bends (nominal length per bend is 2 metres) until the maximum length of 12 metres is
reached Take a maximum horizontal path of Y= 4 metres into account (measured between bends) and
ensure the slope is adequate. Until 6 metres baffle - L - should be used (see page 13 ill.1 L). From 6
metres till 12 metres baffle - M - and - L - should be used (see page 13 ill. 1 M -L)
Connection to conventional chimney (using the renovation kit)
The concentric connecting pieces for existing flues should be used for this purpose and the installation
instructions (apply for these separately) must be followed strictly. Until 6 metres baffle - L - should be
used (see page 13 ill.1 L). From 6 metres till 12 metres baffle - M - and - L - should be used (see page
13 ill. 1 M -L)
8. Construction of concentric Duct system
All components for this duct system and the corresponding guidelines for installation are given in sec-
tion 4. The assembly instructions are as follows:
Fitting exterior wall duct direct or indirect
Direct Connection.
The outlet can be made in the exterior wall, but take nuisance in the neighbourhood into account.
The (Building Materials) Soil Protection Decree contains regulations for this. Also take care that
the wind pressure on the outlet is not too extreme (in very narrow alleyways for example), since
this may have a negative effect on the performance of the appliance.
Make a round opening of 155 mm in the exterior wall (keep an extra space of 50 mm around the
outer shaft if the exterior wall is combustible) and fit the exterior wall duct to the inside of the wall
with the wall plate. Check correct position of the wall terminal (see-TOP). The wall plate of the ex-
terior wall duct should be sufficiently well-sealed against the wall, on account of the possibility of
damp and/or flue gases leaking into the home.
The course of the duct must meet the set requirements.
The duct should be encased if necessary. Adequate fire-resistant measures should also be taken
if the duct is going to be fitted alongside combustibles.
Indirect connection
Establish the position of the appliance and the outlet and start constructing the duct with the con-
nection to the appliance (with an indirect connection always 1 metre vertical first). Pay attention to
the fitting direction (black sealing rings pointing upwards) and use the clamping strips to connect
the elements together.
Fit a 90-degree bend directly to the exterior wall duct and connect to the elements on the appli-
ance. Ensure that all connections are fully gastight.
The =250 mm shorter able pipe can be used between bends or for connection to the appliance
and/or exterior wall duct.
Use wall brackets to support the duct, if necessary.
Fitting roof duct
The outlet can be anywhere in the roof surface (outlet and inlet in identical pressure area) and
must meet the regulations currently in force.
A roof plate for flat roofs or a lead roof flashing for sloping tiled roofs can be used to make a wa-
tertight duct. Various bends can be made if required. The opening in the roof deck should be 5
cm bigger around to provide adequate fire resistance. Centring plates can be put against the roof
deck.
18


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