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Cross talk is unwanted sound which is transmitted from one room to an other through short, common air ducts. The sound transmission loss through common ducts should exceed, by more than 5 dB, the transmission loss of the common wall between rooms. A cross talk-prone situation is shown below.
Separation distance between air outlets
Checklist for Cross-Talk Control
1. Provide long common ducts between room air outlets or inlets.
2. Use layouts which have turns in branch ducts or dog-legged paths between rooms.
3. Line inside surfaces of common ducts with glass fiber (e.g., on all four sides of rectangular ducts).
4. Install prefabricated, sound-attenuating mufflers in common ducts.
Note: Ductwork should not be rigidly connected to partitions because they may transmit mechanical system vibrations. Avoid lightweight wall and ceiling constructions where sound isolation is critical.
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