3.3 Location and Cross Talk Depths

When installing cross talk attenuators, there are numerous locations and arrangements which can be used. Some of these arrangements have been illustrated in 1 to 9. As shown, the sizing, depth and height of the attenuators is typically proportional to the free area of the unit.

Options 1 - 2, If a long attenuator is feasible, 50% free area units are recommended, which results in a longer unit.

Option 3, one of the most popular methods is to install the NAT Vent Attenuator within a bulkhead. The bulkhead is either located within the cellular spaces or under a walkway within a circulation zone, or a combination of the two. The depth of the bulkhead is proportional to the free area of the unit, 50% free area units may require a depth of 1200mm with a height of around 250mm. 20% free area attenuators will only need to be 600mm deep, in turn this unit will require a height of 625mm.

Option 4, an alternative to option 3. In this instance, the bulkhead is only 900mm deep, a 37% free area unit has been used with a height of 340mm

Option 5, a second alternative to option 3, 600mm deep bulkhead, attenuator 30% free area, height of 625mm

Option 6 a further variation on option 3, the NAT Vent Attenuator has been split to allow the passage of services.

Option 7 to 9, Cellular offices/medical rooms require a significantly smaller unit due to reduced air flow rates. A wide range of options are therefore available.