Hoval RoofVent CON-9, Design Handbook

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13 Supply air silencer
The supply air silencer reduces the noise from RoofVent
®
units within the room. It consists of an Aluzinc casing with
sound attenuation splitters and is mounted between the
filter box and heating or cooling sections. Please note the
following:
■ The supply air flow rate is slightly reduced by the addi-
tional pressure drop.
■ Use in combination with an extract air silencer is recom-
mended.
Type ZSD-6 ZSD-9-10
L mm 700 700
W mm 900 1100
H mm 900 1100
Weight kg 90 115
Pressure drop Pa 47 20
Table K21: Technical data for the supply air silencer
Frequency ZSD-6 ZSD-9-10
63 Hz 10 2
125 Hz 13 7
250 Hz 21 14
500 Hz 19 15
1000 Hz 22 17
2000 Hz 22 16
4000 Hz 26 13
8000 Hz 26 11
Sum 19 12
Table K22: Insertion attenuation of the supply air silencer (values in dB at standard
fan speed)
14 Extract air silencer
The extract air silencer reduces the noise from RoofVent
®
units within the room. It consists of an Aluzinc casing with
sound attenuation splitters and is mounted on-site (please
follow the assembly instructions included). Please note the
following:
■ The extract air flow rate is slightly reduced by the addi-
tional pressure drop.
■ Use in combination with a supply air silencer is recom-
mended.
■ The extract air silencer is delivered in dismantled form;
please follow the assembly instructions.
Type ABSD-6 ABSD-9-10
L mm 500 500
W mm 806 1006
H mm 368 405
Weight kg 21 26
Pressure drop Pa 32 19
Table K23: Technical data for the extract air silencer
Frequency ABSD-6 ABSD-9-10
63 Hz -1 -2
125 Hz 3 4
250 Hz 7 5
500 Hz 10 8
1000 Hz 12 8
2000 Hz 11 7
4000 Hz 11 4
8000 Hz 12 7
Sum 8 6
Table K24: Insertion attenuation of the extract air silencer (values in dB at standard
fan speed)
Options
Supply air silencer