Daikin VAM Series Engineering Data page 71

EDMMT712101
Reduction of noise from equipment behind the
ceiling and air passage
1. If noise reduction measures are necessary for large
3
equipment (650 m /h or more), avoid providing the following
constructions as much as possible. (See Fig. 1)
Fig. 1
① Do not narrow down the duct diameter too much.
(Example: 250
② Do not bend too much using aluminum bellows, etc.
(In particular, bending immediately after the main unit
outlet)
③ Do not open the ceiling board unnecessarily.
④
strength.
2. The following countermeasures are available. (See Fig. 2)
Fig. 2
① Use a ceiling component with high sound insulation
(high transmission loss).
< Caution>
In particular, some low-frequency components provide
little sound insulation.
② Add sound insulation materials around the bottom of
the sound source.
< Caution>
Sound insulation sheets need to cover the whole
equipment, but some equipment may not be covered due
VAM-HVE/HVLT Series
150, 200 100)
Countermeasures for noise from the air outlet
(suction port)
1. For ceiling mounted duct type, using the following separately
sold items is recommended.
(See Fig. 3)
Fig. 3
① Silencer box ② Flexible duct
③ Silent supply/exhaust grille
mounted cassette type is used, the following methods are
available. (See Fig. 4 and 5)
Fig. 4
① Use materials with high sound absorption for the room
interior materials.
generated from the air outlet (suction port) itself, and if
has a higher sound absorption effect.
Fig. 5
① Branch duct (divide the amount of blown air and reduce the
② Flexible duct
4. Providing a sound source in the corner of the room is an
effective noise reduction measure for the center of the room,
but not effective when people are present in the corner.
Control System
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