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CC SERIES CIRCULAR ATTENUATORS
H
© FANTECH
2016
The Q-Tech high performance CC Series circular attenuators
are a popular solution for reducing the noise of smaller HVAC
systems utilising round duct.
Units are lightweight, spun end caps are designed for easy
connection to a fan or ductwork. Connecting ductwork can be
rigid or flexible, matching spigot sizes.
CC attenuators are ideal in situations where more acoustic
performance is required than what can be obtained with a
suitable length of acoustic flexible duct and cost precludes the
use of lined metal duct.
Where breakout noise is a critical design parameter refer to the
Rectangular and Circular Series Attenuators.
TESTING
All units have been tested in accordance with BS4718:1971 for
insertion loss. Air flow pressure loss data obtained from
tests conducted on a BS848:Part 1, 1980 test rig.
SUGGESTED SPECIFICATIONS
Circular attenuators shall be of the CC-Series as designed and
manufactured by Fantech Pty. Ltd. and shall have the
dimensions, acoustic attenuator insertion losses and pressure
losses as scheduled.
C
50
AØ
BØ
50
* The above illustrates the superior performance of the ‘CC’ range when compared
to standard flexible acoustic duct of equal length. Both products were tested on
the same test rig.
125
63
250
1k 2k 4k 8k
500
0
10
20
30
40
Octave Band Centre Frequency, Hz
Insertion Loss, dB
CC025H
Standard Flexible
Acoustic Duct
Model No.
CC...
63 125 250 500 1k 2k 4k 8k
020M
015M
3
7
5
9
9
10
17
18
37
23
22
38
15
22
13
19
020H
7 7 11 21 44 33 17 15
025M
1 3 5 12 27 15 10 9
025H
5 5 9 19 39 21 11 10
030M
4 4 8 18 32 16 9 7
030H
5 7 10 26 44 23 11 10
031M
4 4 8 18 32 16 9 7
031H
5 7 10 26 44 23 11 10
035M
3 3 7 17 27 12 8 6
035H
4 6 10 24 38 17 9 9
040M
2 3 6 16 21 10 6 5
040H
4 6 9 23 31 16 8 7
PERFORMANCE DATA
DIMENSIONS
COMPARISON TEST
PRESSURE DROP GRAPH
DESCRIPTION
Model No.
Approx.
CC...
AØ BØ C
wt. kg
015M
150
265
500
1.6
020M
200
320
500
1.8
020H
200
320
1000
3.6
025M
250
365
500
1.9
025H
250
365
1000
3.8
030M
300
415
1000
4.0
030H
300
415
1500
6.0
031M
315
415
1000
4.1
031H
315
415
1500
6.1
035M
350
465
1000
4.3
035H
350
465
1500
6.4
040M
400
515
1000
4.7
040H
400
515
1500
7.0
Static Insertion Loss, dB
Octave Band Centre Frequency (Hz)
Approx.
dB(A)
reduction
14-18
16-19
16-22
9-14
13-19
11-22
13-24
11-22
13-24
12-15
15-18
11-14
14-17
HOW TO ORDER
NOISE CONTROL PRODUCTS
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