Breeze KB 1000, User Manual, Page: 9 / 26

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USER’S MANUAL
FCS-FCD | BCS-BCD SERIES
10
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Louvres on silencer discharge:
o
Ÿ Do ensure that the splitter orientation is at 90
to the louver orientation and place a spacer
between the silencer and discharge louver.
Ÿ
Don't place a silencer immediately in front of a
louver.
CORRECT INCORRECT
Ÿ Do place a spacer between the louver and
the silencer and ensure that the splitter
o
orientation is at 90 to the louver orientation.
Ÿ
Don't place a silencer immediately
downstream of a louver.
Fan positions relative to noise sensitive areas:
Ÿ
Best: If fan cannot be relocated, wrap fan
and surrounding ductwork with a noise
barrier material (When wrapping fans pay
particular attention to ensuring there are no
holes at the joins). Allow sufficient overlap in
the wrap to ensure adequate coverage.
Remember that flexible connections will be
the weakest link.
Ÿ
Do not place fans in ceiling spaces directly
above noise sensitive areas.
Flanking transmission:
Ÿ
Installing the attenuator through or against
the wall minimises the chance of flanking
transmission via the duct system ensuring
the expected performance is achieved.
Ÿ If an attenuator is installed as shown, noise
from the fan can bypass the attenuator and
enter the conditioned space. This is known
as flanking transmission and will negatively
impact on the expected attenuator
performance.
Louvers on silencer inlet:
Better
Storeroom
Best
Better: Do place fans in ceiling spaces
away from noise sensitive areas
Overlap wrap by
100mm at all joins
Attenuator
Attenuator
CORRECT INCORRECT
Ÿ Do use sweeping bends and take offs. Use
long chord turning vanes where possible.
Keep velocities low to reduce airflow
generated noise levels.
Ÿ
Don't use sharp bends or take offs.
Changing direction of airflow:
Ÿ Do ensure velocities through supply and exhaust
grilled are low by increasing the grille size or
number of grilles. Size ductwork for constant static
pressure to each grille, thus eliminating or
minimissing the need for balancing damper
adjustment (which could / can generate excessive
noise).
Ÿ
Don't allow high velocity air to pass through grilles.
When noise generated by grilles could
cause a problem:
CORRECT INCORRECT
CORRECT INCORRECT
CORRECT
INCORRECT
CORRECT INCORRECT
Flanking
Transmission