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FITTING AIR/FLUE DUCT EXTENSIONS
Cutting extensions
• Measure and note the length of
the air duct extension required for
the installation (a).
Note: Extensions should be
assembled so there is a gap of
10 mm between each air duct.
Use this measurement to calculate the
length to cut the air and flue ducts:
Length of Air duct
• Cut the length of the air duct as
follows:
Length of air duct as shown in
fig. 6.1.
Length of Flue duct
• Cut the length of the flue duct as
follows:
Length of flue duct =
length of air duct + 40 mm
• Cut the air and flue ducts square
and and remove any burrs. Care
should be taken not to scratch the
white surface on the air duct.
• After cutting the tubes to size,
insert the flue duct into the air duct
and secure the air duct to the
spacing bracket through the three
pre-drilled holes.
• Install the flue extension.
• Ensure that the air duct clamps are
centrally positioned over the
10 mm gap between the air duct
sections.
• Drill two holes 3 mm Ø through
each air duct (at either end of the
extension) at the most convienient
holes in the air duct clamps and
secure with screws provided.
•
Note: The air duct clamp must not
be screwed to the bottom the
air/flue duct and terminal
assembly, this will allow the clamp
to absord any slight movement in
the roof structure.
10 mm
Length of air duct
10 mm
Fig. 6.1
LAS Euro B/S 081/0
