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Noise Contro_24.qxd 11/11/2015 4:22 PM Page 16 CC SERIES CIRCULAR ATTENUATORS PERFORMANCE DATA DESCRIPTION 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 Static Insertion Loss, dB Model No Octave Band Centre Frequency CC 63 125 250 500 1k 2k 015M 10 18 23 38 020M 17 37 22 020H 7 11 21 44 33 025M 12 27 15 025H 5 19 39 21 030M 4 18 32 16 030H 10 26 44 23 031M 4 18 32 16 031H 10 26 44 23 035M 3 17 27 12 035H 10 24 38 17 040M 16 21 10 040H 23 31 16 (Hz) 4k 22 15 17 10 11 11 11 8k 19 13 15 10 10 10 Approx dB(A) reduction 16-19 14-18 16-22 9-14 13-19 11-22 13-24 11-22 13-24 12-15 15-18 11-14 14-17 DIMENSIONS 50 C 50 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 HOW TO ORDER PRESSURE DROP GRAPH Model No CC 015M 020M 020H 025M 025H 030M 030H 031M 031H 035M 035H 040M 040H AØ 150 200 200 250 250 300 300 315 315 350 350 400 400 BØ 265 320 320 365 365 415 415 415 415 465 465 515 515 Approx wt kg 1.6 1.8 3.6 1.9 3.8 4.0 6.0 4.1 6.1 4.3 6.4 4.7 7.0 C 500 500 1000 500 1000 1000 1500 1000 1500 1000 1500 1000 1500 COMPARISON TEST Insertion Loss, dB H BØ AØ 40 30 CC025H 20 10 63 Standard Flexible Acoustic Duct 125 250 500 1k 2k 4k 8k Octave Band Centre Frequency, Hz * 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 H-16 NOISE CONTROL PRODUCTS © FANTECH 2016