Instructions Installing the duct system
Push connectors into the duct up to the stop stick;
turning them slightly will make assembly easier.
Fix the connectors to the duct using self-tapping
screws or pop rivets. Screws/pop rivets should be
evenly distributed around the circumference. Fix
screws/pop rivets so that the safe rubber strips
are not damaged, i.e. 10 cm from the stop stick
line at the end of the duct.
In the event of incorrect assembly, screw/pop
rivet holes should be sealed up.
We recommend adhering to the following mini-
mum number and dimensions for steel screws/
pressure-resistant pop rivets:
Ød Min. Ød mm Number
63-125 3.2 2
140-250 3.2 3
The ducts supplied are 3 metres long as standard.
If you want to connect two ducts together, use
an NPU nipple with a rubber strip.
Stopsick
Ø 100
Ø 125
Ø 100
Ø 100
Ø 125
Ø 125
Ø 125 RCFU
Ø 125Ø 125 RCFURCFU
TCPU
TCPU
Ø 100
Ø 125
Ø 100
Ø 100
Ø 125
Ø 125
Ø 125 RCFU
NPUSR SR
Ø 125Ø 125 RCFURCFU
TCPU
TCPU
Reductions
If you want to reduce a branch, you can use a
T-section, where the branch on the T-section has
smaller dimensions. If you want to reduce the
main duct, you will need to use an RCFU reduction.
NPUSR SR
Ø 125Ø 125 RCFURCFU
Example
Crossing ducts
If two ducts need to cross, we recommend
installing the duct that runs along the beam
underneath the duct crossing it. This is the best
way to reduce heat loss.
30˚
30˚
30˚
To get your duct down into the insulation as
quickly as possible, we recommend the solution
illustrated.
30˚
70
600
1200
Connection to unit viewed from the side
.
Connection to unit viewed from above.
Connection between ducts and unit
It is important that all 4 flanges are connected
to the ducts with a flexible connection, so that
potential vibrations are not transferred from the
unit to the ducts system.
Avoid bending the flex pipe as this will add to
an increased pressure loss in the system. When
mounting, the flex pipe should be stretched as
far as possible – without deforming the pipe.
It is recommended to use an insulated flex pipe
type THISOL.
Mount hose clamps around the outer layer of
plastic in order to ensure air tightness.
6.3 Connecting the
duct system
19
VIEWA402
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