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USER’S MANUAL
FCS-FCD | BCS-BCD SERIES
09
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4.2 Guideliness for Noise Control
Ÿ
Ensure transitions close to attenuators are
gradual or better still, remote.
Ÿ
Abrupt transitions immediately adjacent to an
attenuator will cause the attenuator pressure
to increase.
Volume Control Dampers:
Ÿ
Allow for a settling duct between volume
control dampers and attenuators.
Ÿ
Don't site volume control dampers or fittings
too close to attenuators as they can cause a
dramatic increase in attenuator pressure
drop.
Attenuators in relation to bends:
Ÿ
Do ensure attenuator splitters are in the
plane of the bend as shown. Fit turning
vanes it R/W<1.0
Ÿ
Don't use attenuator splitters as shown when
sited close to a bend as the pressure loss
across it will be greater than expected.
Transitions:
Ensure symmetrical transitions
from the duct equipment to fan inlet.
CORRECT
INCORRECT
Volume control damper
CORRECT
Volume control damper
INCORRECT
CORRECT
INCORRECT
Ÿ
Place a concrete sleeve around the silencer
to increase the acoustic seal between rooms.
For less stringent requirements, pack around
the silencer with a resilient material to affect
a complete seal between the attenuator and
the opening.
Ÿ
When trying to achieve very high attenuation
or very low noise levels (e.g. NR20) do not
use an inadequate seal between the silencer
and wall opening.
Isolated walls:
Ÿ
Do fix the silencer to one wall only and place
a flexible or resilient seal on the isolated wall.
Ÿ
Don't bridge the isolated wall to the non-
isolated wall with the silencer fixings.
Acoustic sealing of silencers to achieve
low noise levels:
Flexible or
resillient seat
Isolated wall
Isolated wall
CORRECT
CORRECT
INCORRECT
INCORRECT