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Reduction in maximum flue length for each bend

Reduction for bends

Bend

45° bend

90° bend

1.0 metre

Reduction for bends

Bend

Reduction in maximum flue length for each bend

45° bend
90° bend

0.5 metre
1.0 metre

Vertical flue terminal and accessories

Part No.

Description

Min-Max length

530

531

532

523

524

525

526

527

528

529

Vertical flue terminal

Pitched roof flashing plate

Flat roof flashing plate

90-degree bend

45-degree bends (pair)

500mm extension

1000mm extension

2000mm extension

Telescopic extension

Wall bracket pack (5)

1000 mm

N/A

500mm

1000 mm

2000 mm

350/730mm

208mm

Using the dimensions given in fig. 9 as a reference, mark
and cut a 115mm hole in the ceiling and/or roof.

Fit the appropriate flashing plate to the roof and insert the
vertical flue terminal through the flashing plate from the
outside, ensuring that the collar on the flue terminal fits
over the flashing.
The fixing holes for the wall-mounting bracket should now
be drilled and plugged, an appropriate type and quantity of
fixing should be used to ensure that the bracket is mounted
securely. Once the bracket has been secured to the wall,
mount the appliance onto the bracket.

IMPORTANT

The vertical flue terminal is 1.0 metre in length and cannot
be cut; therefore it may be necessary to adjust the height
of the appliance to suit or use a suitable extension.
Connect the vertical flue assembly to the boiler flue spigot
using the 100mm clip, gasket & screws (supplied), ensuring
the correct seal is made. The flue support bracket (supplied
with the vertical flue kit) can now be fitted.
If the vertical flue requires extension/s or additional bend/
s, connect the required number of flue extensions or bends

Fig. 9

(up to the maximum equivalent flue length) between the
boiler and vertical flue assembly (see fig. 8).
Ensure that any horizontal sections of the flue system
have a minimum 1º; maximum 3º fall back to the boiler (1º
= 17mm per 1000mm)

NOTE

When cutting an extension to the required length, you must
ensure that the excess is cut from the plain end of the
extension (see fig. 8). Remove any burrs, and check that
any seals are located properly.
You must ensure that the entire flue system is properly
supported and connected.

4.5.3 TWIN FLUE SYSTEM

The Vokera twin flue system enables greater flue distances
to be achieved (see 4.4.2) than that of a concentric flue
system. It can be used for horizontal or vertical applications,
however the twin flue system must be converted to the
dedicated concentric flue kit for termination. It is essential
that the installation of the twin flue system be carried out
in strict accordance with these instructions.

GUIDANCE NOTES ON TWIN FLUE INSTALLATION

●

The flue must have a have a minimum 1º; maximum 3º
(1º = 17mm per 1000mm) fall back to the appliance to
allow any condensate that may form in the flue system
to drain via the condensate drain. Consideration must
also be given to the fact that there is the possibility of a
small amount of condensate dripping from the terminal.

●

Ensure that the entire flue system is adequately
supported, use at least one bracket for each extension.

●

The entire flue system must be adequately insulated to
maintain heat within the flue system thereby reducing
the possibility of condensate production.

●

As the exhaust outlet pipe can reach very high
temperatures it must be protected to prevent persons
touching the hot surface.

●

The condensate drain pipe must be connected in
accordance with building regulations.

“X”

Twin flue accessories

Part No.

Description

Length

0225805

Horizontal flue terminal

1.0 metre