18
FITTING AIR/FLUE DUCT EXTENSIONS
How to add extensions
Use a saw, tin-snips, etc. to cut tubes
to size.
☞
No tools are required when
separating extensions for cutting to
size air and flue tubes separately.
When doing so, the flue conduit
should be twisted into a position
where the shoulders on the plastic
tube can be pushed through the
spacer-piece. After cutting to size,
refit the flue conduit and secure it
to the air conduit.
Tip:
Start by measuring the required
length of air conduit* (Lair), and then
calculate the corresponding length of
flue conduit (Lexhaust) as follows:
Lexhaust = Lair + 40 mm
Lexhaust = length of flue conduit
Lair
= length of air conduit
* Minimum length of air-conduit
extension: 80 mm.
1
2
13
2
70
L air
Lexhaust
1.
2.
+ 40 mm
27
1
Fig. 9.1: Cutting tubes to size
☞
The seals are sensitive to mineral
oil-based grease products. For this
reason, the seals must not be
greased. If the seals need wetting
to aid in installation, use water
only.
☞
De-burr and file down any rough
edges on the tubes before fitting in
order to prevent damage to the
seals. Remove all metal filings and
other debris.
☞
Do not use damaged or dented
tubes, as they will not form an
adequate seal.
☞
Ensure that the seals remain
correctly aligned when installing
the tubes. Do not fit damaged
seals.
☞
Secure the exhaust conduit with
the fixing device in order to ensure
that it is correctly centred relative
to the air conduit.
Fig. 9.2: Loosening the flue conduit
GU_LAZ 290/1
