Table of Contents
Advertisement
CHAPTER 4
Characteristics
2) When supply air diffuser (and return grille) is sound source
..... part 1
(A) If the main unit is separated from the supply air diffuser
(and return grille) as shown in Fig. 6, the use of a
silencer box a), silence duct b) or silence grille c) is
recommended.
(B) If a draft sound is being emitted from the supply air
diffuser (and return grille), branch the flow as shown in
Fig. 7 a), lower the flow velocity with a grille, and add a
silencer duct to section b).
(If the length is the same, a silencer duct with the small
diameter is more effective.)
3) When supply air diffuser (and return grille) is sound source
..... part 2
(A) If the main unit and supply air diffuser (and return grille)
are integrated as shown in Fig. 8, or if the measures
taken in 2) a) and b) are inadequate, the interior material
in the room can be changed to that having a high sound
absorbency as shown in Fig. 8 a).
This is not, however, very effective towards direct
sounds.
(B) Installing the sound source in the corner of the room as
shown in Fig. 8 b) is effective towards the center of the
room, but will be inadequate towards people in the
corner of the room.
50
Fig. 6
Fig. 7
Fig. 8
a)
b)
c)
a)
b)
a)
b)
Advertisement
Table of Contents
