Noise Control - CTS / CTL / CTU / CTZ Cross-Talk Attenuators Series

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The Q-Tech range of Cross-Talk attenuators has been designed to provide a low resistance to air flow whilst maintaining a high degree of acoustic attenuation.
The CT series should be considered wherever a relief air passage is required to penetrate a building?s acoustic barrier.
Four styles are available in both standard and high performance configurations:-
- CTS - for simple wall penetration above ceiling
- CTL - wall to ceiling penetration
- CTU - ceiling to ceiling penetration
- CTZ - installation within the wall

Installation - General
Special care should be taken when installing CT Series Cross- Talk units to ensure maximum performance.
Consideration must be given to the sound rating of the wall or ceiling being penetrated.
It is essential that a tight air seal is achieved between the cross talk unit and the wall/ceiling penetration.
When high performance units are used additional mass lagging of the unit casing may be required to prevent flanking
transmission. This can usually be provided by building-in the cross-talk unit during the building construction phase.

Selection Procedure
1. Select the Cross-Talk attenuator type that is required ie. CTS, CTU etc.
2. Select high or standard performance attenuation as required.
3. When the relief air quantity is known read from Table 1. the width and height combination for your needs.
4. Determine final product code for ordering.


The Q-Tech CT Series acoustic performance is quoted as
airborne sound transmission loss as defined in AS1191:1985.
Performance data is based on Australian sourced and
manufactured products.

Suggested specifications

Room to room Cross-Talk attenuators shall be similar to Q-Tech CT models and shall have the acoustic performance as scheduled. The cross-talk attenuators shall be of a proven design and must have an established history of use. Each unit shall consist of a galvanized sheet metal casing and be provided with internal parallel splitters. The splitter infill material shall be a sound absorbing material as specified by the manufacturer. The infill material shall be covered with a gauze scrim to prevent erosion of the fibers then encased in galvanized perforated sheet metal. The infill material when tested in accordance with AS1530, Part 3, 1989 shall have the following indices:-

Instability 0
Spread of flame 0
Heat evolved 0
Smoke developed 0
The contractor shall ensure that an air tight seal is achieved around all wall penetrations to maintain acoustic integrity. Where necessary additional mass lagging shall be applied to the outside of the attenuators to prevent flanking transmission. All units shall have a constant active acoustic length irrespective of grille or section size. Standard units shall have an active length of 900mm and high performance units an active length of 1800mm.
Acoustic performance specified is quoted as transmission loss as defined in AS1191:1985.

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